Ultimate fuel economy thread! How efficient is YOUR S-chassis or Z? How'd you do it?

[mrmephistopheles]

The reason I ask is this - last year I put an S15 final drive into my car. It has taller gearing, good for about 10% difference from the OE gearing. My previous best fuel economy was experienced in 2003 on a cross-country trip across flat land at sustained speed, and I netted 31mpg on one tank. For my S13 and its 15.9 gal tank, that means an almost 500 mile range!

Since then, I never filled it up (thanks to a stupid leaky seal which makes for a gassy smell above 3/4 tank). It sat for 4 years, got a brief tuneup, then was driven intermittently, usually short distances up till now.

Since the S15 final drive went in, I haven't been able to even guess as to my fuel economy since my speedo and odo are off by 10% - they read low, btw.
I recently had to make a 96 mile round trip over somewhat hilly terrain with about 20 miles of freeway driving and speeds ranging from 35-75mph.
I topped off the tank before I left and did the same as I returned, both times at the same gas station. I used a total of 2.5 gallons. I verified the mileage both with the odometer (adding 10%) and via a Google Maps direction thinger. They were within .5mi.
If you can't seem to mathify that, it ends up being a little over 38mpg.

I'm not leadfooted or overly miserly when I drive, and there was a fair amount of stop-and-go associated with the trip. Somehow I managed to get 38 fucking MPG out of my 20 year old POS13.

Mods: (bold = relevant to fuel economy)
S15 final drive (3.69:1)
zenki S13 front lip spoiler
simple aluminum skidplate
183k+ miles
Stock KA24DE, dirty air filter, stock exhaust, stock suspension
BNR32 front brakes, Z32 rear brakes
S14 SE wheels, worn-out tires, bad alignment
engine grounding kit
old oil which needs replacement
water for coolant (what's antifreeze?)
bubbling purple tint


tl;dr - 38MPG from a mostly stock S13. wat.

Uploaded gear ratio calculator for you to check out the differences based on final drive, transmission ratios and tire sizing. It's not mine, author credit is within the spreadsheet.
http://hotfile.com/dl/120108838/e8c3c64/gearcalc.xls.html

[future]

I call bs. 38 mpg on a ka 240

Best I ever pulled was 22mpg mostly freeway cruising

[mrmephistopheles]

I call bs. 38 mpg on a ka 240

Best I ever pulled was 22mpg mostly freeway cruising


It's actually the truth though. Nobody was more surprised than me. I have a short (8-10 mile) commute that I do ~12 times a week, and it feels like I burn gas at about 10mpg. Being unable to actually figure it out made it that much worse.

That 31mpg i mentioned was at a sustained 70-75mph across almost completely flat land for hours on end.

[PoorMans180SX]

Best I ever pulled was 22mpg mostly freeway cruising

Something is wrong with your car. I get a minimum of 25mpg. I've hit a high of 29mpg highway cruising at 65mph on a roadtrip.

When I get my VQ and longer final drive in, I'll bump this thread with new figures. :2f2f:

[ZenkiKid]

i averaged 24-26mpg combined on a s13 with 17x9s in the rear with a sohc that was on its last leg and was leaking every liquid that an engine has.

How did i do it?
-Steady driving. As in no sudden acceleration or braking. Used the momentum of the car to my advantage
-Overinflated my rear tires. I believe I am around 38psi
- Stayed in the higher end of the RPMs
- was on top of my oil changes

[deolio]

best mileage i've gotten in my z was 31 mpg driving from santa barbara to davis (101 to 46/41 to 5 to 80) with the cruise control set at 75mph. the engine is completely stock and stock final drive of 3.538.
relevant mods:
aero - ings+ front lip and stillen roof spoiler
tires - 235/40f 265/35r @ 36psi cold
wheels - weds tc105n (17.6lbs front, 18.4lbs rear)
suspension - zp coilovers basically as low as they go

[DreamN]

35mpg all day long without even trying...










in my cube of course. lol The S13 averaged mid to high 20s for me when it was running healthy.

[jorge1190]

I drove from Central Va to Virginia Beach (about 200 miles each way) when I had my KA with exhaust, test pipe, and intake. I filled the tank up before i left, drove down there, drove around and came back all in one tank. Highway driving I have seen about 32-33 when I had a KA, I dont know what my SR will do.

[shinobis13hb]

good thread..
i have been wondering what i can do to improve my econ..
let me ask this please , if one of you would awnser kindly.
a leak in between the turbo and elbow(gasket is going out) that would hurt my fuel econ dramaticlly?? i think im correct . recently my econ has gone down SO much.
typex blacktop car got me around 300-40 miles to the tank now i am getting around 250ish
FMIC
aero.
apexi intake kit w/HKS mushroom filter
turbo back exhaust.
BLITZ tuned ecu
megan tracks
hankook ventus evo v12 tires.
arms n all that.

[didderson]

Great thread man!

The trick to a good MPG reading is filling up at the SAME gas station with the SAME pump number. I'm not sure if you did this OP. Some stations leave me a gallon below full.
Also, you should get a larger reading and keep track of gallons input so you have a larger mileage covered. I tend to give it 5gal here and there and then one day fill up before the price jumps (because i watch oil barrel prices). Sometimes I have 750 miles between a full tank, but I keep all receipts which help me tally the total gallons purchased.

:::::::::::::ANYWAYYY:::::::::::::
I average 31mpg and usually make it to the same pump each time. My best was a straight shot with some rest stops from Lancaster to Pittsburgh, PA at 34 mpg.

Pignose with a lip. Small skirts, and I need to put the roof spoiler back on. No rear spoiler.
Sr20det stock turbo stock tune FMIC, walboro, 93 octane, oem ignition timing, ngk plugs N60 MAF SAFC2. Cleaned up wiring and vacuum (NO EMISSIONS BULL)
HKS Supersound BOV which helps decrease wasted fuel by surging the turbo below 5psi and then 'blows off' at all psi's above it. I can hook it up correctly but then the stock ecu tune makes the car backfire and stall too much.
alum driveshaft and pulleys except oem crank pulley.
Comparable stock tire sizing on stretched 17x8.5's. (205/45/17 hankook ventus v12)

MPG tips:
Remove excess weight! This one is huge! Every nut and bolt counts!
Drop it in neutral whenever you can.
Stay in the vacuum when accelerating
Make sure no excess drag is being created (Brakes work good) (Run 0* toe)
Get low: Lots of drag underneath!
Hood prop mod might actually help pressures at the firewall
Skidplate
Negative camber with 0* toe can decrease contact patch which helps mpg.
Lighten all rotating parts :)

Engine shot vid: http://youtu.be/YwcYTZTEbz8

[g00se]

Wow at best ive seen 25 mpg. Also is the s15 final drive the same as the q45 (3.69)?

[240sxr]

nice thread

to the OP,....i have driven a tall gear diff. on a stock KA ,they feel gutless...maybe you got that mileage because you don't have to shift so much with those longer gears, what RPM did you had at 75 MPH in 5th gear????

[codyace]

Final Drive: 4.08
SR20DET, Stock Trans
33MPG highway

Final Drive: 4.63 (Xterra)
SR20DET, Stock Trans
31 MPG highway

400hp (20) psi car, 300hp (10 psi) car.

Key is to not drive like an asshole. Car gets fantastic fuel milage on highway...infact better than my 96 Maxima beater-car./

[bg.tech]

Best i get is like, 12mpg. wtf, man? =(

i know i have like, 110-145-145-145 compression. Could that be why?

[jamg]

what in the world....

[SuicidnS13]

Awesome thread... I cant wait to update with mine... My goal is to have my pfc tuned for fuel efficiency hahahahahah.... Cant wait to see my tuners face with that one....

[90hatchie]

drove 109 miles yesterday one way
some stop and goe but mostly highway driving
burned up about half a tank
mostly 70-75mph with some boosting (first time driving car longer then 15 min)

[tabasco122]

28mpg on a fully built sr with stock gearing and stock turbo.

[Lukasss]

Got about 430 to a tank on Mid-grade this weekend driving. Majority of it was highway miles.

So thats like 30.4 miles to the gallon or something around that. Pretty decent for a stock KA. Auto as well. Stock LSD

[jamg]

i've only managed to get 312 miles to a tank. it's what? 12-13 gallons?

of premium too :(

[godrifttoday]

41

Msglength

[tabasco122]

28mpg on a fully built sr with stock gearing and stock turbo.

i should add that im 9:1 compression, dont know how much of a difference that makes.

[Prime]

Stock KA24DE with around 300k miles on the clock... Got 24.6mpg combined as of the day it blew the headgasket. And I mean literally on the same day, as I filled up 15 minutes before catastrophic failure. On teardown I found it had destroyed rod bearing #3 and was working on #2, in addition to clogged water jackets on cylinder#4 from god knows what.

Anyone getting less than that needs their shit checked.

[LOVERboy]

best i got was 29MPG mostly freeway.
average from home to school (42miles trip everyday. half is street...) is about 22 to 25MPG.
mods:
t28
370cc
n62
emance tune
making [email protected], [email protected] @10lbs

[future]

God how the fuck are you guys doing this?

I have a stock ka. Runs perfect, no CEL good compession. I maintain it all no leaks. I've read somewhere that 240s new got 21/24 mpg street/freeway

So 21 years later I think 17-21 is not too bad

I have a j30 vlsd if that changes anything

[driftn_silvia]

its true..when I had a 91 s13 KADE I was averaging around 30-33mpg freeway that was with 17x9.5 wheels & s13 vlsd. Now the 90 s13 KA24E that I own gets a bit less around 26-29mpg. Also it depends what gas you put in.

[azienbabyboi]

best ive done was 33mpg hwy across AZ & NM on stock KA hotshot 1pc headers, aem intake, 2.5" catback 78xxx miles

now t25 7psi mostly city some hwy between 19-23mpg 82xxx miles

[future]

I only put shell 91 so that's not my problem. New plugs, new everything in my bay. This is not making sense -____-

[rat240]

I would like to at least get 25 plus mpg on one of my 240's

What is the best way to achieve the 30+ mpg club

[Prime]

I only put shell 91 so that's not my problem. New plugs, new everything in my bay. This is not making sense -____-

Not meant as an insult, so please don't take it as such but... you're 18. I'm betting your foot is a lot heavier than mine. Also, there's really no reason to be using 91 in a stock KA. My mileage was all on 87.

[future]

No problem I know what your asking. But my drive is a cruise 50 miles a day and I. Cruise at 75mph 3500rpm. I'm young but I pay for all my own shit so I know the value of a dollar and gas is not cheap. I try to get the most mpg I can and that's the best I can get

[sephiroth99]

I calculated one time, a small trip with like 99% highway, and I did 34MPG. It was a mostly stock 240sx, only mods were a cone air filter, a test pipe and a drop.

[One_love_silvia]

on the trip up to long beach this year i got about 30 mpg from SD and to LB and back. mostly freeway, but also sat in stop and go traffic for about 2 hours straight, so... /shrug

tho in the city i seem to get MUCH worse. granted, i leave my car running alot while im on deliveries (id rather use gas than burn an alternator out), and i do quite a bit of spirited driving. i mean my foot is heeeeeeaaaaaaavvvvvy. i dont really speed much, but i definitely accelerate alot xD.

even then tho, after installing my new intake, it seems like im getting worse mileage than before i had it. but again, my heavy foot comes into play again lol

[Jsal32]

I wonder what would have better MPG results a 'pop-up' front end or a 'silvia' front? Silvia front is lighter but the pop-up seems to be more aerodynamic (if lights are down).

I hope some good info comes from this thread. I have a '92 coupe and i drive about 110 miles a day. I want to get my car to reach low 30 mpg #'s. The alternative is buying a CRX HF... but I actually like driving my 240sx and would love to keep it as my daily.

Heres my contribution to this thread:

ecomodder......com.

Lots of good info. I would love to see more S13 specific mods though...thats where this thread comes in.

-Jose

[hokie240]

I have a 90 hatch with silvia front. I didnt notice a difference with MPG with the silvia front. About a month ago i drove from central VA to NJ (360 to 375 miles) i averaged 31 mpg. Mostly highway however some stop and go around northern VA.

Mods relevant to MPG:
Stock sohc (rebuilt-has 40k miles on it)
z32 vlsd-J30 axles
front lip

[Z_Spool]

Where's Nieko? If memory serves correct he was getting around 40-ish MPG a couple years ago on a trip to Vegas. This was when he was still running his beast-spec KA24E, which was the most solid single-cam I've ever come across and running super slammed with the pignose lip. Next to no undercar drag meant good highway mileage. :)

[afiser]

28-30 regularly in my extremely stock '95 s14

drive like a grandpa, fuck other impatient drivers who think they need to floor it whenever they are accelerating their vehicle.

like 20% of my driving is in neutral, if i know a stop sign/light is coming up ill drop it in neutral well ahead of the said stop sign/light. barely use my brakes.

[240sxluver4life]

i get about 29 average mpg in my almost stock s14. i also run HUUUGE tires on the back so my speedo is slow about 7 mph when going 70. After compensating i think i get around 34-35 mpg :)

[Tanuki]

I have read MANY reports that say that the brand of gas rarely produces a difference in fuel economy, and much of the quality is the same across the board as well.

Anyway, my stock KA24 with 17x7 wheels has gotten 25.8mpg exactly on my last 4 tanks.

I guess I drive exactly the same pattern on every tank.

[pacotaco345]

I got 32 mpg on my way to zomg and back, 220 miles on a little less than half a tank. Drove like an idiot on the way up there trying to hang with the caravan but drove 65 the whole way back. It seems to like 89 better than 87, gets wayy better milage
S13 coupe
Chuki front end w/pignose lip
Lowered so the lip is about an inch off the ground
5-spd
Stock S14 ka with timing chain rattle and eh.. compression
Dildo shifter good for 10 mpg
Oh ya I forgot.. I have a 3 in hks hi power and header.. cone filter as well
No emissions stuff either...

[Steinkrunk]

fuuuh, don't know how much I'm getting but I'm betting its <20mpg. I'm guessing you cali guys still have all emissions stuff in. Anyone getting high MPG without emissions stuff? I need to get a cluster with an odometer so I can figure out my MPG. But since I have smaller diameter than stock tires I'm guessing it's horrible. Also, are these cars tuned/not tuned? I feel if i could lean out the car alittle I could get better MPG and a slight increase in HP. Smells like I run pig rich anything under 3k, that's without butterfly valves tho so I'm guessin that's the reason.

[Sileighty_85]

My S13 Built SR gets about 26-28mpg on highyway, not sure city probably 15mpg lol

my S14 RB25 gets about 17mpg City (i got a lead foot) if my wife drives it gets about 21mpg, and about 26-28mpg Highway (and that was with a bad MAFS before)

[CrimsonRockett]

When I drove like a grandma, I averaged 26-31mpg in my '92 S13, but then again it had 40,000 original miles, new tires, proper alignment, full tune up, etc. Same goes for my old '90 S13 with 60,000 miles. I filled up before leaving for Norcal. Made the entire drive without filling up once and only stopping for food.

When I had it lowered on coilovers, intake, header, exhaust, 17x9|17x10's and cambered in, averaged roughly 350-370 to a tank.

Extremely careful now with my driving. Picked up a cheap 4 door/4 cylinder car that gets great gas mileage as well. It definitely helps in the long run. Gas prices aren't going down any time soon. So, gotta squeeze out as much as you can possibly get out of every gallon.

[enkei2k]

S14 (17 gallons)
Stock KA
Exhaust/Intake
18" Z33 V1 Track rims with 225/40 235/40
Average about 300 per tank on a good month on 93 octane. 98% local street driving ~ 17.6 mpg. Damn, I'm getting V6 numbers.

good thing i only fill up every 6 weeks or so lol

surprisingly, gas prices have come down here. When I last filled up, it was at 4.49 for 93. Now it's 4.29.

[dued]

I'm getting like 12mpg on my 95 ka24de. Only mods are intake & 3" exhaust. I haven't had the compression checked, might be the problem. What about using a Techron treatment in the fuel tank?

Oh & I only using Chevron 91

[Tanuki]

^Sounds like your car is trashed haha. I would get it checked out.

[jiggysnitz]

All the people who are getting under 20MPG without driving like assholes are probably driving typical 240s. As in: poorly maintained motor with sensors that are old and sending the wrong signals, terrible alignment and a welded diff.

Its like a vicious cycle, too poor to fix car, made poorer paying to fill it up.

[T chop]

When I had my shitty SOHC I would get like 350-400KM to a tank. Haven't driven with the SR yet but hopefully I will get around 30MPG highway like a lot of you guys.

[PoorMans180SX]

I have a welded diff, stock suspension, and my compression numbers are 145-135-115-115 (230,000 miles) and I'm still getting 25mpg all day every day. I use mid-grade and synthetic 10w-40. And I'm not exactly "light" on the pedal.

There's definitely something wrong with some peoples cars.

[KiLLeR2001]

I get about 21 city and 24 highway with my redtop SR. VLSD, new subframe bushings, gas tank cleansing coming up soon, so I'll be sure to record any differences. I also need about 2 inches moar low.

[KOME]

I get around 20 MPG on my 93 KA24DE.
I know there's something wrong, i get a pretty distinct smell of gad sometimes, if i turn my A/C off the idle will die, and sometimes when i shut my car off i can hear an odd noice coming from my fuel cell.

[onehundredoctane]

I have a 17 mile commute to work, so my drive to work is all interstate and 65 mph. I've seen as much as 24.9 mpg in my S14.

1997 240sx
-Automatic trans, so rpm's stay high at interstate speeds, I'm going to convert to a 5 speed soon.
-stock wheels, tires with 50 sidewalls instead of 55
-header, full 3" exhaust
-Injen cold air pipe and K&N filter (filter needs to be changed)

I've been knocking the car in neutral and coasting when possible, try not to get over 2k rpm when I don't have to. What's really amazing is when you decide to alter your driving habit and really start to notice a difference in mileage. Previously I usually saw 20-22 mpg, but as I've already mentioned driving with some common sense now I'm seeing close to 25 mpg.

[mrmephistopheles]

Great thread man!

The trick to a good MPG reading is filling up at the SAME gas station with the SAME pump number. I'm not sure if you did this OP.

I average 31mpg and usually make it to the same pump each time. My best was a straight shot with some rest stops from Lancaster to Pittsburgh, PA at 34 mpg.


I was able to get to the same pump, and during both fillups, the gas was actually above the little flap thing, so it was absolutely full.

Wow at best ive seen 25 mpg. Also is the s15 final drive the same as the q45 (3.69)?

Yep, same ratio.

nice thread

to the OP,....i have driven a tall gear diff. on a stock KA ,they feel gutless...maybe you got that mileage because you don't have to shift so much with those longer gears, what RPM did you had at 75 MPH in 5th gear????

It's a little gutless, but I haven't had a need to wring it out anytime recently.

41

Msglength

You have no more contribution than that? I'd like to believe you, but could you at least flesh out the circumstances/specifics around it?


Not meant as an insult, so please don't take it as such but... you're 18. I'm betting your foot is a lot heavier than mine. Also, there's really no reason to be using 91 in a stock KA. My mileage was all on 87.

Agreed. Age/maturity sometimes tends to lighten ones' foot. I haven't used any octane above 87 since ~2002.

28-30 regularly in my extremely stock '95 s14

drive like a grandpa, fuck other impatient drivers who think they need to floor it whenever they are accelerating their vehicle.

like 20% of my driving is in neutral, if i know a stop sign/light is coming up ill drop it in neutral well ahead of the said stop sign/light. barely use my brakes.

Nice!

[blueshark123]

i turn off my car and let it coast if i have to get off a exit, going down hill or if i know im going to stop up ahead that helps with gas mileage but just remember if you try it the car loses power to to steering and brakes so its all manual lol.

[Silverbullet]

I'm pulling about 30-32 mpg on the high way in a KA powered S14. Body is JDM, tires are 225 front, 235 rear with 300 wear rating. Combined I get anywhere from 25-27mpg.. not too shabby.

[future]

Its gotta be my sensors. I take car of my car. Its no hoopty. No check engine lights. Only mods are coils and arms. I have done my own alignments so I know there done right. Even on my other ka I got the same mpg. Maybe cause I live in Socal and there is no thing as constant speed driving? No matter what time of day. My car doesn't burn oil. No deffects. And still never beat 22.2 mpg

[mulinmoua]

I get 25 mpg mostly city driving, I don't baby it, just normal driving. My old 240 with 80xxx did around 10-15 mpg due to a bad radiator. Was a minor leak but once I change the radiator, went back to 25-27 mpg. Hope that helps anyone.

[FaLKoN240]

SR with T28 FMIC typical intake, downpipe, test pipe, 3" exhaust crap.

I get 25 mpg with mixed city/freeway driving.

I recently changed all my exhaust side gaskets. Not sure what else could make my MPG go up or down. I like to boost occasionally.

[Perfect Balance]

Last time I checked mine in August of last year, I averaged 34mpg on a 250mile trip with a stock, lowered 240, but it was 90% highway miles. I imagine its a bit worse now, but still, I'm not complaining.

[camaro379ss]

Rebuilt SR with intake, 3" full exhaust/downpipe/test pipe, 11psi....etc

From pittsburgh to indy I got 36mpg. Since then it has gotten 0mpg cause it doesnt move cause I keep throwing parts at it.....and for the next 6 months it will also not move because i will be in basic training for the army.

[Flicktitty]

1993 240sx Coupe 28XXlbs with full tank of gas
2JZGTE AUTOMATIC 4.08 Gear
PT6265. 550cc injectors. bolt ons, Apexi afc neo tuned.
408RWHP 389TQ

on a 200 mile trip on the freeway i got 33.8mpg.

i've had a stock 91 Auto hatch into the 28-29mph highway range with just typical maintenance and driving like a sane adult.

[Karlitos]

I can get from school Cal Poly SLO to home Imperial Beach, CA in 3/4 tank driving under 3k. Driving back through LA traffic it takes the whole tank. Approx 330 miles, and s14 tank is 16gal? so about 27mpg. Stock KA I/H/E. Although i usually get about 23-25 since i will drive faster through no-mans land. Through the city i struggle getting above 20mpg but i know its my driving through the city, for some reason i dont like to shift...

Also a friend that works on RX-7's said that coasting in gear saves gas because the ECU shuts off injectors or something like that, he tried it and tested it with wideband and calcs and he said he got better mileage that way than coasting in neut. I havent tried it, maybe its just a mazda thing?

So in the city 18-20 and HWY short trips 20-23, long trips 23-27. Pretty good I say. Nothing but cheap 87 from costco (cheaper). once in a while ill use shell since its a block away.

[camaro379ss]

I
Also a friend that works on RX-7's said that coasting in gear saves gas because the ECU shuts off injectors or something like that, he tried it and tested it with wideband and calcs and he said he got better mileage that way than coasting in neut. I havent tried it, maybe its just a mazda thing?


hmmm.....uh......nevermind

[[email protected]]

my shit gets poor gas mileage. rebuilt SR forged internals stock comp. i filled up 2 days ago, put 43mi since then and im down to a little lower than 3/4 tank. those are street mile. anything i can do do get better milage? im running an hx35 and dont boost much.

[Leetheslacker]

Thread seriously makes me think somethings wrong with my car.

95, 100% stock and maintained. 218k. No matter how i drive it i get 23mpg. Drive like a grandma, 23, put my foot down often, 23. Same station, same pump.

CEL is on for egr. Although i've heard mixed things about cars running real rich after egr removal.

[Prime]

Agreed. Age/maturity sometimes tends to lighten ones' foot. I haven't used any octane above 87 since ~2002.


Age, maturity, and the desire to not lose my safe driving discounts.

As for the fuel, I'm fairly certain that 87 is a bit more fuel efficient. Less energy to initiate that burn, likely closer to stoich/mildly lean. That has nothing to do with me buying it, as the only reason I ever step up to 89 is when I know it's going to be 110F+.

I'd hate to be driving something tuned on the edge during a California summer.

[mrmephistopheles]

I uploaded a gear ratio calculator for you to check out the differences based on final drive, transmission ratios and tire sizing. It's not mine, author credit is within the spreadsheet.
Hotfile.com: One click file hosting: gearcalc.xls (http://hotfile.com/dl/120108838/e8c3c64/gearcalc.xls.html)

For my car, stock RPM @ 70mph was nearly 3000, and it dropped to 2650 with the new final drive. I'm certain that it's just being been very efficient lately (with the final drive helping it out).

The calculator was originally set up for hondas (hence the high rev count listed), but the transmission ratios are from S13/S14.

[Silverbullet]

I'm skeptical about ppl getting 34 mpg (and up). How accurately are we calculating this? If one is guessing how much gas is being used, the figures won't be accurate.

The most common way is taking a full tank of gas as the reference, with odo reading 0. On the next fill up, take the miles driven on the odo and divide by the amount of gas put in the tank to fill it up.

I hope we're all doing this.

[codyace]

I'm skeptical about ppl getting 34 mpg (and up). How accurately are we calculating this? If one is guessing how much gas is being used, the figures won't be accurate.

The most common way is taking a full tank of gas as the reference, with odo reading 0. On the next fill up, take the miles driven on the odo and divide by the amount of gas put in the tank to fill it up.

I hope we're all doing this.

People are using the later method, how else would they do it?

[onehundredoctane]

Thats how I've been doing it. I'm consistantly above 22 mpg in the Nissan, but it varies up as high as 24.9 mpg, and as low as 22 mpg when I drive like a teenager.

[initial_jc]

Im getting about 27,I get 300ish miles in 3/4 of a tank. I commute on the I-5 at about 70-75 in a stock kouki.

[fckillerbee]

on my s14 with stock KA. advanced timing, big heavy wheels. I was getting around 25mpg. I drive a 50 mile round trip. So it was easy to do the math.

On the s13 with sr. I'm still checking, but seems to be about the same. Must be the route. I'll do a complete check when I fill her up all the way. I usually only put in about $40..which is 3/4 a tank.

[initial_jc]

I always wondered if a CA18 would crack 35?

[A18]

In my pretty much stock skyline (intake, exhaust, 11psi) the best I've ever gotten was 32mpg, all highway driving. If its just city driving it dips down to about 27mpg.

[codyace]

I always wondered if a CA18 would crack 35?

with the right tune I wouldn't see why not

[future]

I'm wanting answers. I drive like a grandpa. Good running ka and I've never touched 23mpg

[strictly_JDM]

MPG also depends on your commute.....here in Cali, we might run into hills,traffic,stupid drivers vs someone that lives where its completely flat with no one on the road.

Weather plays a factor too, faster your engine can get to operating temp, the less gas you will burn heating up your engine.

vehicle maintenance, driving properly with anticipation of others driving (avoiding unnecessary stops or slow downs) , proper alignment and tire inflation..etc. will yield to better results, in any car.

Just remember what your right foot is stepping on..the GAS pedal.. !

[rowley65flip]

Thread seriously makes me think somethings wrong with my car.

95, 100% stock and maintained. 218k. No matter how i drive it i get 23mpg. Drive like a grandma, 23, put my foot down often, 23. Same station, same pump.

CEL is on for egr. Although i've heard mixed things about cars running real rich after egr removal.


I had a stock 95 with egr delete and mixed highway/sitting in traffic for 45 minutes a day, and some times using the AC I averaged 31.5 MPG. Based off my experience I would say there is something wrong.

EDIT: This was also in Indiana where it is pretty flat.

[camaro379ss]

^^I hear ya there.

before I sold my b13 it always floated around the 35-38mpg mark. But then again I rarely feel the need to floor my cars and/or go more than 10 above the posted speed.

[Leetheslacker]

I had a stock 95 with egr delete and mixed highway/sitting in traffic for 45 minutes a day, and some times using the AC I averaged 31.5 MPG. Based off my experience I would say there is something wrong.

EDIT: This was also in Indiana where it is pretty flat.

Cincinnati is relatively flat.

I was worried about being rich after EGR delete and clogging the cat up. I've had a blockoff plate for a while just unsure if i should do it. If i had no cats it'd have been gone forever ago, but i'm in love with my stock quiet exhaust haha.

Put some 89 in today, seems a little happier in this heat. Realized i broke an exhaust stud scraping on something a week or two ago. Gotta fix that and double check timing for the hell of it.

Could just be a tired engine though, 218k is a lot. Been considering getting rid of it as a daily but if i can get it to do anywhere close to 30mpg i'd be a really happy camper.

[camaro379ss]

out of curiousity what gas station do you use? When I lived in the cleveland area I tried sunoco a few times a got shitty mileage and my car ran bad. This was the only times I have ever used them since we dont have them in central indy.

[Leetheslacker]

out of curiousity what gas station do you use? When I lived in the cleveland area I tried sunoco a few times a got shitty mileage and my car ran bad. This was the only times I have ever used them since we dont have them in central indy.

Usually speedway. Cheapest cigarettes lures me in.
Had a car or two that would ping on shell but not on anything else so i avoid that if nothing else out of habit.
Aside from that i've never actually noticed a difference between stations and i've put most brands in this car.

[camaro379ss]

yea I usually dont have problems no matter where I go but after my few year stay up there many people in the area either had terrible problems or wouldnt go anywhere else.....tho I guess thats not much different than anything else in the world.

[future]

Yeah I have mountains stop go stop go. Just did the math and I'm getting 22.8mpg stock ka vlsd dropped no a/c on cruising 75mph

[Geezy]

i fill up once a week with Shell 91 and i put on about 285 miles to a tank. i really dont know how accurate my fuel gauge is cause it constantly fluctuates, randomly up and down. must be the level or something. i've ran it to E and the light doesn't even come on anymore. so usually at about 285 miles i fill up. that usually ends up with 12gallons being pumped so thats about 23-24mpg. i think thats pretty sorry.

i got a stock red top with the basic bolt ons.
- an open BOV so i know im running a little rich.
- i recently discovered an exhaust leak before the o2 where the 5bolt gasket is at. i get a lot of backfiring.
- i think that 12fuckingdollar rubber O-ring for the fuel pump is going out cause i can smell fuel when its been sitting in the sun for a minute.
- perhaps my front toe is out a little.
- probably wouldn't hurt to check the timing either.

i need a tune, an AFC or ROM or some shit. i want that 30+mpg.

- wheels and tires are 18x9.5 215/35s and temporarily got my drift spares 17x7.5 215/45
-suspension on Stances max low with outrageous camber outback.

[future]

I get about 300-330mpft. That's horrible. But I have a great running car and horrible cali driving. Is california my problem to bad mpg?

[shiftdrift]

Usually get 29mpg in my s14 but my maf is bad so atm like 25.....new maf on the way

[onehundredoctane]

Putting the car in neutral when downhill, or hitting an on/off ramp has really started to pay off for me. One day this week I managed to coast 7/10 of a mile without even dipping under the speed limit! While coasting my rpm's are at 800ish, so I can imagine that will add up to better fuel economy in the long run!

[JM42]

i have a 96 stock ka, 175k, 90% highway mi 29mpg
ac delete and automatic witch shifts really late and hard for some reason
jus swapped the clutch fan in favor of dual elec units hoping to break into 30's

I dont drive like a jackass but I also wont hesitate to put my foot down n pass someone who imo is going too slow

[Kevin_S14]

quick question while we are kinda on the subject, would i run into any trouble if i started to run octane 91 gas into my car (stock KA) i have been always using 87 since i got the car. and is it worth the change?

[Nick_04K]

Your in Arizona... So i would follow suit with what the Cali guys just said.
87 is absolutely fine for your stock KA, however if it's going to be 110 degrees or some shit you could think about being generous and running 89.

Here's mine;
92 Hatch
rebuilt KA (6000 miles)
Intake
Stock exhaust
I have always gotten between 19-25 mpg. Closer to the later during summer.
And this is with fairly conservative driving (Shift ~2500 and very few full throttle pulls on a tank) Maybe 2 or 3 short ones usually.

[t_rempel]

Used 47.5L driving driving 608km through BC mountains today. All highway with little concern for mileage.

7.81 litres per 100 km
30.11 miles per US gallon
36.16 miles per Imperial gallon

1990 5spd hatch w/~225k
K&N filter in modified stock intake
Resonator removed from stock exhaust.
Tires at 38psi
Zenki lip if that makes a difference

[shiftdrift]

Got a new maf now I'm getting 30mpg with 87 stock engine97 s14

[spiderlone]

I get about 26-31 mpg with my sr20, basic upgrades.

[redhatchy92]

17 mpg with a single cam with 115k miles i have replaced o2 sensor, all injectors, fuel filter.... no use. plan on going dohc t25 setup by the end of the summer anyways. plenty of low end torque to get good mpg.

[st165]

getting 16-17 mpg on my s14.sr20de matic 18 inch tires.intake,exhaust. normal?
13-14 on my s14 sr20det matic all stock.

[illvialuver]

That sounds good mr. Meph, I wonder what is like if you have a 300zx trans or 350 trans. Also, I alwayst thought running 91 was cleaner, and more efficient. Am I wrong? And this is for a stock ka btw.

[maverickmotorsports]

Keep your KA's below 100kph(62mph) and you'll see way better fuel economy.

There is a trigger in the OEM ecu that will make it run rich above that speed.

It's bee found in the bin on the ecu's and I also verified it on my old KA24DE S13. Cruising I was getting 14.5-15.0 AFR's until 62mph. After that the AFR's dropped to 13.5ish. I can't explain why the KA's have this but I know for a fact that SR's do not. I don't know if S14 KA ecu's have this.

It can be tuned out but you need to mess with the bin file and have a ROM tuned ecu.

[RB24_S14]

I got 35mpg on my stock S13, Now I get 37+mpg on my S14 stock KA, 87. I drive like a grandma. 65mph @2700rpm on Cruise control, 18's, fresh motor.

[strictly_JDM]

29.32213

Pretty much 30MPGs on a 400 mile road trip.

From San Francisco to Los Angeles.

Cruise control set at 80mph. 187k on her, 5 speed. Proper maintenance, tires are inflated properly, fresh spark plugs and wires, new 300zx fuel filter. all the good stuff.

[Karlitos]

hmmm.....uh......nevermind

Well apparently my friend was right, &#x202a;Top Gear challenge London to Edinburgh Part 2&#x202c;&rlm; - YouTube (http://www.youtube.com/watch?v=E5SCfsALPug) Coasting to a stop in gear saves gas...

embed fail http://www.youtube.com/watch?v=E5SCfsALPug skip to 9min 5sec

[iLagX]

s13 intake manifold, dizzy,
97 ka24de build engine high compression..
one piece drive shaft
z32 fuel filter
17x8, 17x8 1/2
2 way kazz lsd 4.08
subframe collar
gets 18-22 mpg...

anyone know if i can use

any know if running s14 maf sensor and get better mpg??
or s15 diff?

[Pandapants]

I took a road trip recently and netted 31mpg in my rb20. Consistent highway speeds of 65mph.

15 in/hg + 2 liter = :)

Just bolt-ons and stock ecu tune.

[94spitfire91]

I call bs. 38 mpg on a ka 240



No i was averaging 35 on the 200 mile highway trip the day i bought my 240. It might have been slightly less but definitely in the 30s

[koukidriver]

How about a fully S14 Ka-t?

JW tune

Gt3071r

dw 740cc

Z32 maf

Q45 diff

What do you think my Gas mileage might be? It not great but I imagine around 15mpg.

[wuddup]

Completely stock s13 KA24DE just ran 370 miles on a full tank (mostly freeway but also there was a LOT of traffic on some days). The needle was just a bit under the E line and I drove for about 10 more miles, but my low fuel sensor never lit up so I dunno if its broken or I still have fuel, but I filled up after 370, didn't want the car to die on me.

Anyways so I estimate 23 mpg am i doing it right? lol.
And does the driving under 62 mph a significant difference? I'm in the middle of testing it so far but definitely feel like a grandma w/ everyone tailgating and zoomin past me lol but it should be worth it

[jesse_s13]

140k
s14
stock ka
cold air and egay exhaust

29 mpg... cheveron gas all day.
Drive around 65 mph.

[rcdad123]

i have an 89 hatch with stock engine. only mods are cat back exhaust, 225/45/17 tires. i can get 270 miles per tank. the most i`ve pump in the tank is 13 gallons. so i calculated about 20 mpg. some times i dip to 18 mpg. chassis and engine have about 35k miles. i do drive at 3,000 rpm on 5th gear on the freeway. but i usually speed up to about 3,500 to 4,000 rpm on freeway transitions. love those long sweeping turns. if the car is not so much fun to drive, i would be driving my wife`s civic.

[SBCsx]

i have an 89 hatch with stock engine. only mods are cat back exhaust, 225/45/17 tires. i can get 270 miles per tank. the most i`ve pump in the tank is 13 gallons. so i calculated about 20 mpg. some times i dip to 18 mpg. chassis and engine have about 35k miles. i do drive at 3,000 rpm on 5th gear on the freeway. but i usually speed up to about 3,500 to 4,000 rpm on freeway transitions. love those long sweeping turns. if the car is not so much fun to drive, i would be driving my wife`s civic.


damn you have 35k miles on the chassis as well?

[illvialuver]

Also, want to maximize mileage, up the airpressure. If your running 32, then try running 38, tires might not last as long as 33-35 depending on tire size, but airpressure is a big factor.

[rcdad123]

yah, i got the car from a high school. car was donated by nissan back in 89. it had 206 miles when i got it 2 years ago.

[h2v7]

sohc, intake, headers, exhaust(isis straight pipes), advanced timing, removed all egr, no cat.


id say i get 16ish ?!

[Magical Trevor]

SR swapped coupe, stock manifolds and turbo, built internals. 350z track wheels and Z32 brakes. Last week drove around Detroit on the highway and some in town driving. I had 2 highway races and one 60-130mph pull. Averaged right around 25-26mpg. Not to shabby for beating on it.

[Cypher02xd]

My first s13 was a white 5 speed hatchback, and with just a catback I averaged 31.5mpg on a trip from maryland to virginia through the mountains on a car with 151k on it. After I put the sr in it I was able to get about 28mpg on average communting to work.

My coupe when it was auto averaged at 26mpg, all stock and 82,174 orginal miles after tune up. Now that it's a 5 speed and got alot of mods (cams, intake manifold, header, catback, etc...) I average about 28-30mpg depending on how I feel when I drive it. It's also tuned personally by me on the AEM EMS, and I am still tweaking my cruising afr a bit so that mileage may go up as I adjust things a bit.

Also a friend that works on RX-7's said that coasting in gear saves gas because the ECU shuts off injectors or something like that, he tried it and tested it with wideband and calcs and he said he got better mileage that way than coasting in neut. I havent tried it, maybe its just a mazda thing?

This is true of any ecu AFAIK. The computer shuts off fueling to the motor and allows the engine to engine brake itself to slow down. I've seen it on 3 different makes/models of my personal vehicles with widebands installed. You're better off leaving the car in gear when you're slowing down if you're looking for better mileage than putting it into neutral for this reason.

[95_S14]

Keep your KA's below 100kph(62mph) and you'll see way better fuel economy.

There is a trigger in the OEM ecu that will make it run rich above that speed.

It's bee found in the bin on the ecu's and I also verified it on my old KA24DE S13. Cruising I was getting 14.5-15.0 AFR's until 62mph. After that the AFR's dropped to 13.5ish. I can't explain why the KA's have this but I know for a fact that SR's do not. I don't know if S14 KA ecu's have this.

It can be tuned out but you need to mess with the bin file and have a ROM tuned ecu.

I tryed this yesterday driving 60 mph I filled my tank til it over filled and drove 220 miles with 6.40 gallons = 34.3 mpg and I had the ac on the whole time . Stock 96 ka with 140k on it just keep it up to date fresh oil plugs cap rotor just need new tires that's what the trip was for , oh and driving 70-80ish I got 23 mpg so I guess I better leave sooner if I want to go places lol

[nathanong87]

stock s14 sr ~27-30 mpg , on fresh oil change, 65 mph (just hair below 3k) on 235/40-18 in the back. basic bolt ons. stock turbo. stock ecu. all highway. with wind tunnel test bn sports kit.

mixed driving ~ 20-23 mpg

hard drive probably 15 or below.....

[Hanzi]

how many mpg would a stock 90 240 get it? its sohc.

[95_S14]

how many mpg would a stock 90 240 get it? its sohc.

55mpg , but really you have to think how many miles on the motor how you drive mods tire size why don't you fill your tank and see what you get

[One_love_silvia]

a month ago i took a trip to la and back to SD, and i got 32 mpg. that was with just an intake and exhaust, and running 87 octane. plus i also had an extra bumper in my car, along with my little brother. an sat it traffic for around a total of atleast 20 minutes. so i probably coulda gotten more.

sadly, i only get around 16mpg city tho =(

[curbhuggerrps13]

averaging 24-27 mpg . sr with bolt ons and t28. no faster than 65mph

sbc your signature just made my day :bowrofl:

[di-devol]

MPG 29.9 highway
Stock rebuilt SR with 9k on it
Open BOV
Welded diff
180sx wheels
1pc driveshaft
cheapest tires I can get, normal air pressure.

I haven't calculated city mpg

[illvialuver]

Whoever said the thing about the gas mileage sucking after 62 mph is right. I drove from Costa Mesa Ca to fresno Ca this weekend, and filled up with 89 octane and 36 psi in the tires and only used 1/3 of a tank going there, then I filled up again on the way back and got the same milege, I am sure it would have been a little better if the cruisecontrol worked. that is roughly 265 miles on bout 5 gallons of gas. Super good gas mileage.

[unreal-]

96 S14
---------
I/H/E (leaking between 4th runner and EGR)
S13 Cams
25* timing
VLSD
bad alignment

If i dont drive like an asshole, i usually can get 260-270/tank and when i fill up i take between 10.5/11.5 gallons. And thats with the tank almost on E. Since theres no warning light, i usually fill up when the needle starts getting near E. Im sure if i ran it to fumes i could get 300mi/tank.

Once i get a proper alignment, fix the leak, and get a tuned ECU im sure my MPG will improve.

[FaLKoN240]

Just get an alignment, you're basically throwing money out the window (wasting money and time) if you don't have your car aligned.

96 S14
---------
I/H/E (leaking between 4th runner and EGR)
S13 Cams
25* timing
VLSD
bad alignment

If i dont drive like an asshole, i usually can get 260-270/tank and when i fill up i take between 10.5/11.5 gallons. And thats with the tank almost on E. Since theres no warning light, i usually fill up when the needle starts getting near E. Im sure if i ran it to fumes i could get 300mi/tank.

Once i get a proper alignment, fix the leak, and get a tuned ECU im sure my MPG will improve.

[unreal-]

Just get an alignment, you're basically throwing money out the window (wasting money and time) if you don't have your car aligned.

Yea, i realize that. Waiting to get my rear 5lug, ES FLCA bushings, and my ERS springs installed on my Fortune coilovers then i'll get an alignment.

[new2240s]

I have a freshly rebuilt ka24de (300 miles) with forged internals JE 9.1 comp, 248/248 cams, z32 MAF, AFC NEO.

Right now I am doing almost 100% city driving in Seattle and am getting 17.2 mpg, I am thinking that isn't too bad especially since I am letting it idle 2-5 min before driving it.

[2forty]

Whoever said the thing about the gas mileage sucking after 62 mph is right. I drove from Costa Mesa Ca to fresno Ca this weekend, and filled up with 89 octane and 36 psi in the tires and only used 1/3 of a tank going there, then I filled up again on the way back and got the same milege, I am sure it would have been a little better if the cruisecontrol worked. that is roughly 265 miles on bout 5 gallons of gas. Super good gas mileage.

rob are you saying you got over 50mpg? lol. you arent driving a prius.:bs: haha

[zurud]

I got 20 mpg city with my sr20det 240sx. I am not really happy about it especially with 93 octane gas. Do you guys think 240sx with lsx t56 and 2.73 rear end will get 30mpg city?

[bb4_96]

^ definitely

[IHasLongTorso]

rob are you saying you got over 50mpg? lol. you arent driving a prius.:bs: haha

It would actually be just under 50 by his math but he needs to do it again top off the tank and then again when he gets there to know exactly how much fuel he used. His math is based off 250miles using roughly 5 gallons. But if he used 6 or 7 it would be between 35 and 42 miles to the gallon which id say is believable. More believable than a member on here claiming 50some odd mpg with a single cam with a 255lph fuel pump. Lol no.

[TwelveAM]

I've noticed that mine gets about 20mpg since it's not tuned yet..

740cc injectors are killing me, makes me want to invest in a hybrid for a daily commuter.

[2forty]

It would actually be just under 50 by his math but he needs to do it again top off the tank and then again when he gets there to know exactly how much fuel he used. His math is based off 250miles using roughly 5 gallons. But if he used 6 or 7 it would be between 35 and 42 miles to the gallon which id say is believable. More believable than a member on here claiming 50some odd mpg with a single cam with a 255lph fuel pump. Lol no.

i quoted 265 on 5 gallons. thats more than 50. 53mpg. i call fakies haha. if he can drive 680 miles on a tank ill shut up. thanks andrew. and i saw your goofy ass face in the mag haha.

[kevin_s13.5]

S14
Rb25
j30 vlsd
aluminum driveshaft
stock injectors
255 pump
tomei fpr
greddy open bov
Ebay gt28

I got 26 mpg on mostly freeway.

[JKL1031]

dont care becah race cah.

[Mountain_Man]

my rb20 s13 hwy got 25 mpg.

93 octane
no air filter
no intercooler
no radiator fans
welded stock diff
stripped interior
r33 gtr wheels in the front
300z wheels in the back
SLAMMED
low compression

i thought that was good.

[8Nismo9]

Would you say the sr20 gets better fuel mileage than a ka24?especially if you stay in vaccum

[silva.240]

my 92 ka24de with suspension and no power add-ons . i have recorded 22.3 mpg on long highway drives. that is with an average speed of about 75 mph . with a couple pushes towards 90-95. i'm sure i can bring up the mpg to about 24 if i drove like grandma, but city driving is under 20 mpg.

[didderson]

Would you say the sr20 gets better fuel mileage than a ka24?especially if you stay in vaccum

Definitely.

If you are light on the throttle on both engines, the SR20 has less displacement, and a lower compression ratio than a KA at full vacuum, so in theory a KA will always need more fuel to cover the increased compression volume.

Small engine turbo is great. 30+mpg and 2xx horsepower whenever you want it :)

[Purestock240]

single cam with intake/ header and exhaust

18 mpg if im driving up and down hills and stiuff/ stop and go

27mpg if i baby it and don't change elevation at all

[8Nismo9]

I could see a 510 with a stock SR20.and any lightweight parts and CF parts would be great on gas mileage

[EvilEgg13]

my 93 ka24de got 32.5 averaging about 70 over a 200 some mile trip

Stock engine, minus megan cat-back exhaust with rattling baffles and aftermarket filter.



Definitely need to test this under 62 mph mpg boost.

[Shift n Drift]

time of day matters too guys, remember fuel expands when its hot outside, I drove my accord to ohio from florida last week, left at 1am got 435 to tank, filled back up at 8am and got 460.

[g00se]

So I've been tracking my fuel mileage since this thread started on Fuelly and I still have not been able to break 24 mpg (completely stock 1998 ka24 but on heavy 18" 350z anniversary wheels)

I am always up to date with maint and the car is running fine. Does the efficiency of having i/h/e add another 6 mpg?

[djaztek12]

i only get 17 mpg mostly freeway driving on a 1995 s14. 205 miles per full tank.12 gallon tank:mad: wtf. is something wrong.lol any tips from the experts.:bowrofl:

mods.
stock ka24de internals
cams
cams gears
headers
intake
cat back exhaust
18" racing hart wheels

[rb25crazy]

damn, I get roughly 20-25 mpg in city seems pretty weak imo. I have short commutes like 3-4 miles. Sometimes it feels as if I am only getting 15 mpg...

Stock ka24de
injen intake
5zigen border 3 exhaust
coilovers

that's about it... car is not pulling any cel or anything.

To the guy who mentioned that the car can get tuned out in the rom... how or where to do that? i drive 75+sometimes on the freeway would like to make it no rich if possible.

also, what happen to the gear ratio calculator file it's a dead link =(

Thanks!

[KiLLeR2001]

I get about 21 city and 24 highway with my redtop SR. VLSD, new subframe bushings, gas tank cleansing coming up soon, so I'll be sure to record any differences. I also need about 2 inches moar low.

Drove to Atlanta and back not too long ago, recorded 30.1 mpg on the SR. Overall I'm satisfied.

[Levan. B]

I drive mostly city every day in my bone stock Dual cam car, gets around 28 MPG.
No idea what highway would be.
When I went from 18" Battles to S14 SE's I gained 5 MPG.

[shiftdrift]

in my 97 s14 with 208k miles i'm getting 27mpg average. about 350-360 miles out of 13-14 gallons. hilly driving and some highway.

[jesse_s13]

95 ka 150k

exhaust and intake
17"oz light weight wheels & tires at 35psi

Texas to California.
Loaded with a about 300lbs worth of stuff.

About 70mph
444.8 miles per tank or 32 mpg. On 87 octane.

Mileage improved once I put more miles on the car.

[laurentj23]

26-27 mpg hwy.
3" catback exhaust
Tenzo r short ram intake
New fuel filter
New plugs
New plug wires
Cleaned injectors
Burned oil?!!
Auto driving arnd 75 mph

Cel on due to egr..

[Piggy]

Average 25mpg give or take driving normally.
Have pulled off just over 30mpg if I remember I'm trying.
rb25, hx35, aftermarket internals, stock s14's, open bumper.

If I really try, I do wonder... I can get around everywhere reving a max of 1600rpms.

[di-devol]

29.98 Highway
19.2 city(grandma mode)
I can see the gas needle move when I'm hard on it.

built sr
gt2871r
850 Sards
Tomei 256's
bkr7e's
stock fuel pressure
JWT tune

17x10 heavy rims all 4
coils
camber in front -7
-1 camber in back

[rb25crazy]

ahhh i see, damn yesterday I went on the highway i'm getting like 33mpg. I wonder how much of an improvement one will see with the j30 or q45 3.69 ratios. If anyone else have any more input on that besides the op let me know please.

[benz88]

91 S13 5speed
27mpg city, 35highway
stock KADE
Aftermarket Intake/Exhaust.
stock VLSD
lightweight 15's.
75,000miles on the motor

[Lynk444]

^ What's you aspect ratio of your tires? Rotational weight of the wheels has a big impact on fuel economy additionally smaller than stock diameter tires will show better mpg where larger than stock diameter will show less when using the trip odometer.

28.5mpg, 40 miles a day, 80% freeway/ 20% city

1993 S13 SE Coupe
Stock KA24DE Stock intake and exhaust
Full suspension with coilovers
16" wheels with 225/50r16 3% larger diameter than stock.

Best run ever was 31 from NM to AZ the day I bought the car.

[jmac636]

My green kouki 1995 ka24de autotrajic just ebay exhaust gets 350-360 to a tank mixed city/hwy miles.

My red zenki 1995 ka-t, Holset He341 turbo-15/20psi, built engine, std bore 9.0:1 comp, Bc 264 cams, nismo 740cc inj. Nistune ecu, 18x10 wheels, 3" catless exhaust, gets 300 miles to a tank with some playing and gets 280 with a hell of alot of full throttle runs and street sliding on 93 octane fuel. On e85 and 15psi I would only get 220ish to a full tank but the gains in fun factor is well worth it. When it gets hot out I will run E85 again. Keeps my motor happy in the hot summer months.

[rb25crazy]

soo.... my biggest question is, what is the usual "city" driving mpg of a 3.69 gear ratio on a stock ka24de, on avg from peoples measurements. not just some pull out of the air numbers, please. if you have this info please chime in.

thanks

[koukisilvia123]

I get like 14-17mpg, mostly highway, what the fuck?

rebuilt ka24de, ARP headstuds, Felpro Headgasket
gt28r, 550cc, n62 tuned in person my emance

[boost1986]

My first ka s13 I had got 27mpg (city,highway). My sr20(stock) s13 about 22mpg. Wrx about 23. I miss the stock KA!!

[soryu]

out of 5gal i got 136mi.
so 27.2 mpg average
150-150-150-150.
new plugs,wires,O sensor,K sensor,K&N filter, cleaned MAf.
stock s13 121k mi.
open air box mod.
205/45/16 3.9% smaller ratio. i think it brings my mpg to 26.4

[mad-ass]

I was having some MPG woe's for past couple of month since I am now making a commute in my S14.

Picture of the car in this "more MPG" quest.
http://i393.photobucket.com/albums/pp18/h0y0ung/Forum/IMG_1610.jpg
1995 S14 KA24DE 187,xxx miles as of this week.
5spd manual with 4.08 Kaaz 2 way.
17x9+17 225/45/17 all around
only engine related "mods"
3" Circuit sports cat back exhaust
255lb walbro fuel pump.
everything else is stock.

I was getting 18~20mpg MAX driving at 65MPH no AC on. and I was also throwing P0170 code, so I started picking at things.

Here's what I did so far.

New fuel filter[Z32 WIX filter]
New air filter
cleaned the MAF
New upstream O2 sensor
New Spark Plugs
New Spark Plug Wires
Fresh Oil change with Rotella/new filter

applied full vacuum pressure with the engine off using hand pump vacuum to...
-the EGR on the vacuum port couple of times to "un-stick" it.
-EGR-BPT valve and cleaned it off and couple of full vacuum pressure on/off.
-applied full vacuum to the FPR couple of times.

And replaced any questionable vacuum lines

Now, the P0170 code is still there and it always comes back on every time I reset it. so I'll actually have to check the injectors next. But my MPG shot up to 25mpg under same driving conditions right away. which in tern I will save about $100 just in fuel cost a month with the amount of driving I do a month[roughly 1,600 miles a month]

[jamg]

seriously, WTF @ all these KA's that are getting close to 30MPG

[BoostinIX]

I saw 30 on the last tank with my KA before we ripped it out. Figures, last one is there just to troll me...

[Frank_Jaeger]

I recently got 26.16mpg on my S13. Stock NA KA, automatic transmission. 200k+ miles. Some highway driving, in excess of 80mph, some city driving.

[twofortydubsix]

old car:
http://i134.photobucket.com/albums/q120/lucasweeks/Photo0279-1.jpg

driving seattle to sacramento on i5:
got 33 mpg all highway on the KAde.

then i went sr:
http://i134.photobucket.com/albums/q120/lucasweeks/110622_001-1.jpg

highway got 35 mpg.


i laugh hysterically at car commercials advertising "All New 2012 _____, 35 miles per gallon!"
really? 20 years later and cars are getting the same mileage as my 1990 pos drift car? pathetic

[lude4life13]

Bone stock 1996 KA with exhaust getting an average of 29-30 mixed MPG with over 140,000 miles. I got 460 miles to a tank once. It also feels stronger and healthier than other KA's I have driven so I guess that's what happens when you take car of these cars.

[mad-ass]

well, my car is back to getting 20 mpg once again due to same code, i guess I'll really have to check out the injectors. I hope I don't find more then 1 injectors leaking, really don't feel like buying more then 1 brand new injectors.

[onehundredoctane]

My 1997 S14, KA with injen cold air pipe, 4-1 header, 2.5" mandrel bent exhaust gets 25 ish mpg all day. ONCE I got 33 mpg when I was on the interstate and set the cruise to 65 mph and the majority of that trip was on level ground.

[soreballz]

I did some MPG calculations for my drive today. 133 miles from the gas station, to work, and back to the same pump at the same station. It was all highway, save for about 4 miles of no-traffic/minimal lights city driving. I did 75-80 pretty much the whole way, with full throttle pulls onto the highway and a few full throttle slow driver passes at a wee bit past the 75 mph limit. I used 4.4 gallons of fuel. That's 30.2 MPG while driving like an asshole.
This pleases me.
Specs - '89 coupe, stock KA24DE, homemade 2.5" axle-back, cheap intake, 215/45/17s on fairly light 17x8s, and a 3.9 J30 diff.

The last time I logged my MPG was on a 100 mile trip through backroads at 55-60, babying the throttle for gas sipping purposes, and it only put down 29 MPG. That was pre-tune-up and with a heavier wheel/tire setup, though.

[Drifting Kalamari]

In my bone stock 1996 S14 w/ Auto tranny I used to get 22-24mpg.

I lowered and replaced shocks, tierods, ball joints and tires. After my alignment I now get 30-33mpg with premium! :D

I do: 70% 70-80mph, 30% 40-55mph on average. And I like to floor it every chance I get.

[JasianBlazin]

I just don't see how some of you are getting 30-35 mpg highway. LOL at 41 mpg.
240's brand new from the factory only get 26 highway.
Factor in your driving 20 year old car.
Even if the engine was rebuilt along with new sensors, fuel system yada yada yada I'd hardly doubt it.
Whatever makes you feel better about owning a 240.

I get about 20-22 mpg driving like an old lady. Stock KA new spark plugs & wires, fuel pump, fuel filter, distributor cap and rotor, o2 sensor, and injectors on 91 premium.

[Frank_Jaeger]

I just don't see how some of you are getting 30-35 mpg highway. LOL at 41 mpg.
240's brand new from the factory only get 26 highway.
Factor in your driving 20 year old car.
Even if the engine was rebuilt along with new sensors, fuel system yada yada yada I'd hardly doubt it.
Whatever makes you feel better about owning a 240.

I get about 20-22 mpg driving like an old lady. Stock KA new spark plugs & wires, fuel pump, fuel filter, distributor cap and rotor, o2 sensor, and injectors on 91 premium.
My 240 has improved by 3mpg since my last post, just by staying under 62mph. Almost 30mpg.

[iLagX]

I just don't see how some of you are getting 30-35 mpg highway. LOL at 41 mpg.
240's brand new from the factory only get 26 highway.
Factor in your driving 20 year old car.
Even if the engine was rebuilt along with new sensors, fuel system yada yada yada I'd hardly doubt it.
Whatever makes you feel better about owning a 240.

I get about 20-22 mpg driving like an old lady. Stock KA new spark plugs & wires, fuel pump, fuel filter, distributor cap and rotor, o2 sensor, and injectors on 91 premium.

same here!! i get average 16-24 mpg from city to highway

[jamg]

I just don't see how some of you are getting 30-35 mpg highway. LOL at 41 mpg.
240's brand new from the factory only get 26 highway.
Factor in your driving 20 year old car.
Even if the engine was rebuilt along with new sensors, fuel system yada yada yada I'd hardly doubt it.
Whatever makes you feel better about owning a 240.

I get about 20-22 mpg driving like an old lady. Stock KA new spark plugs & wires, fuel pump, fuel filter, distributor cap and rotor, o2 sensor, and injectors on 91 premium.
fucking this x10000000000000000000000000000000000000000

your STOCK KA engine must be the shit of a unicorn, getting 26+MPG.

i get about 150miles to a half tank.

[Drifting Kalamari]

I always thought the same and thought my 22-24mpg was good. "For a 4-cyl?!?! It's okay b/c racecar!!"

I did no magic, just cleaned throttle body out (it was sticking), basic tune like normal and fixed all/any suspension issues.

I was now getting 28 avg. on cheapest fuel afterwards but for some reason on 93oct I get 33mpg avg.

If I just do a long drive on the highway going 70 I can get 440 miles and still have 1/8 tank left. ...so about 37mpg Highway


Used to be 300-320 before E, Now it's 460-480 before E. And that's with daily spirited driving!



ALSO, I have NO bumpsteer at all after doing tie rods and joints!

[Frank_Jaeger]

fucking this x10000000000000000000000000000000000000000

your STOCK KA engine must be the shit of a unicorn, getting 26+MPG.

i get about 150miles to a half tank.
Sounds like someone's upset with their subpar fuel efficiency :D.

I was meticulous collecting my data and calculating my fuel efficiency. I can't speak for everyone else, but I know my data is clean.

[Drifting Kalamari]

I'm OCD and calculate mine every time I fill up. At the same station and same pump even.

Your 240 can get better mpg!

I hit 210-230 miles at half a tank.

Oh, and I don't top off. I slow it down and when it clicks that is it. I had a cap go bad once I guess due to overfilling a lot a long time ago

[Drifting Kalamari]

I thought 23mpg avg was good for a 2.4L bc my first car was a '97 del sol and that was a 1.6L and got 42mpg avg and I drove it like I stole it. (young and dumb)

[TheRealSy90]

I limiter everywhere so I get 50 miles a gallon.

[Rich260z]

Bumping this thread because I'm about to do a cross country trip, Daytona Beach FL to Los Angeles CA

During 3.5 hour drives, almost all highway I see around 25mpg while doing 85ish. I get about 20-23 around town, depending on if I use the AC a lot or not (a lot right now since it feels like hell here in FL). Engine is a bone stock ka24de with 127k miles, did a minor tune up about 20k miles ago (spark plugs, cap rotor, belts, water pump, front oil seal) but that's really about it. Still has the stock 4.08 in it.

Those numbers were with my stock 4 lug 205/60/15 tires, I've since moved up to 245/40/17 and that does affect it a little.

During my trip, I want to do a full tank with AC on and with AC off to see what the difference is. have a new compressor so the pulley loss hopefully isn't that bad.

I'll also try variable speeds like 70mph compared to the 85mph, and I'll do the headlights up and headlights down to see if that makes a difference as well. If you think of any other ways to test is let me know.

Lastly, car is auto at the moment, but I will swap a 5 speed in while in CA and I will check what kind of mileage on the way back.

City: 20-22mpg AC on always
Highway: 25mpg ac on doing 85mph

[zenkiset]

^holy thread revival, Batman! lol

[Tempo]

meh since its up

96' S14
MODS:
stock KA24DE (~80k on the clock) oil changes every 2k conventional(yes i know)
5 speed plain jane clutch
stock intake/header setup
2.5in straight pipe no cat
pbm solid subframe risers/spl solid dif bushings(unsure if bushings help but the response is a lot nicer and not mushy like brittle old oem ones)

hwy @70mph: 28/30mpg
city: 22/24mpg

can't complain for a 2.4l

[Rich260z]

Tempo, what kind of tire size are you running?

[Reece]

1989 240SX Hatch, stock KA Single Cam, Lip, Coilovers, Welded diff.
City: 19
Highway: 21

I got 26-27 before welding the diff, so fuel efficiency dropped a lot. Worth it.

[Tempo]

Tempo, what kind of tire size are you running?

215/45/17 right now, -3.0f/-0.5r yokohama I forget which brand for rear tired, falken azenis front. Welded diff.

Sent from my SGH-M919 using Tapatalk 2

[Drifting Kalamari]

1996 auto, no cruise, cold A/C, bone stock, 1.75" lowering springs with -1 camber all around, Ebay dual cat back exhaust, stock 205/60R/15 tires, 32-37psi (factory recommends 29psi...), 89 octane (never noticed any significant improvement using premium). Burns a quart of oil between each 3k change, yay valve stem seals. 155k miles.

I get 24-26 average daily (half city half 70-80mph hwy) and that's while stepping on it after every red light.

When I go on long trips I get 30-32mpg going 80-85mph the whole time.

[Rich260z]

Jsut completed the first part of my trip and the results are in:

Stock drivetrain, auto, correct diameter tires (but tires are wide 245s)

Cruising at 70mph with minimal AC use (used for about 1/4 of the tank): 28mpg
cruising at 70mph with ac on the entire time: 25mpg
cruising at 77-80mph with moderate ac use (used for half the tank): 26mpg
cruising at 85mph with ac on the entire time: 23.5mpg

Didn't do the headlight test, but I can't imagine it getting that much worse. The perfect speed is probably 65-70 as that's when I saw the highest. Not bad results considering its mostly stock with 130k on it. I'm sure if it was lower and there was a smaller air gap, and I had lighter wheels like stock 15's on 195s it would be even better. I'd like to get a taller final drive, like a J30 diff or something and I"m sure I can get 30+ without breaking a sweat.

[Gar9854]

91 base model hatch
286k on the chassis and maybe on the motor
Full interior
G33 wheels with 205/40's
Straight pipe from the cat back
Full emission delete besides the cat (still passes in GA)
Mishimoto rad and fans wires to a thermostat switch
Maxxed out on Megan coils with 1 collar at all 4 corners.
Unknown alignment that's WAY out of spec since its with stock arms
I averaged 27.8 mpg with 85% or more all city driving and the only time I was on the interstate I was well over 80mph from waking up late for work.

I use 87 octane from jones petrol (Valero stations)
I need to check timing and injector seals since if I'm stuck at a light for too long when I shift from first it'll pop a baby flame from time to time but thumps everytime

[Rich260z]

Ok so now that I'm 5speed and driving back to FL I'm getting different results.

Car now averages about 27/28 with ac on at 70mph.

The weird part is that the final drive is now higher than the auto tranny (.759 compared to .694) so the rpms are actually highers. 70mph is now about 3k rpm, it used to be about 2700rpm.

I'm thinking this is due to the weight of the damn auto. I think it was about 200lbs compared to like 76lbs ( I weighed the manual tranny on a bathroom scale, just guessing at the auto weight, but it was heavy as F***)

[Kanto]

95 S14 auto. stock except dropped a bit on AGXs and a GP Sports Spec D. Currently averaging about 24mpg about 70% highway going between 65-80 depending on traffic. I'm sure driving in SF isn't helping my overall as it can drop down to 22 if I drive a lot of city.

[gnozahs]

91 s13 manual. I get 14mpg, 15 if im lucky. Stock ka24de :( i dont know what's wrong with my 240 lol

[mad-ass]

95, stock KA, 5spd, 3" cat back, Kaaz 2way, 245/40/18 on 9.5J 275/35/18 on 10J, 13"/F 12.8"/R brake rotors, tein lowering springs, stock body.

I get a mix of 23~26MPG using Arco/AMPM 87Oct. Tried Shell, 79/711 and Chevron and i get 19mpg. no matter how I drive.

I'm sure my 275's in the rear doesn't help much with MPG's on the car though.