Quote:
Originally Posted by The Dude
 I have a stock Miata and it doesn't get 30mpg. |
It needs an LSx drivetrain with six speed to get the 30mpg. My stock 240sx gets 24mpg but with an sr20det @ 400 horsepower I get 30mpg.
furthermore, I bet your OEM engine would put down 30mpg if (choose some):
you refreshed all the oil seals including piston rings in the engine and increased the compression ratio
you reduced the engine RPM on the highway
you fine tuned the engine to cruise around 15.2:1 air fuel ratio
installed high efficiency / highly atomizing fuel injectors with sequential EFI
increased the strength and size and duration of the spark at the plugs (MSD box comes to mind)
reduced rotating mass of components such as flywheel driveshaft wheels accessories
reduced the drag of wind resistance by lowering the vehicle or altering its shape
Lots of things you can do to improve fuel economy. I can think of many more but Ive got to go to class now.