octane

[handinpants]

In California the most common highest octane gas is 91 octane, I can find a few places that have 100 octane but it is around $10 a gallon.
I have an sr, and I am wondering the breakdown of mixing 91 with 100 and figuring out what the octane goes up to when mixing them, half and half.
Also I want to know if there is a safe cheap alternative to boost the octane ?

[slider2828]

Yes cheap best way is spray.... you know that acquamist or snow performance stuff. Those are the best to get better octane. I mixed 91 and 100 I think its not that good. I run 93.5 and that is way better than mixing 100 and 91. Yah get that methanol mix system, people swear by it if you don't track your car...

[Dousan_PG]

spend money on a good tune thats with 91 octane?
that's what i think would be the safest and boost more