Octane Questions Regarding Your Mods & Engine...

[DJ metadelic]

I have not noticed a substantial difference between the 87 and 91 offered in my area.

Even with running the numbers. But still, there is a price difference and that's what I watch.

I run 87, did on my other two CB's always have and until I have a major issue as a result will continue to.

[deevergote]

The F22A1/4/6 are designed for 87 octane. The ECU is tuned for 87 octane. There really is no benefit to be had for running anything higher. Chances are, if you see a difference with a higher octane fuel, it's because either a) you're driving more carefully, because you expect better results (self-fulfilling prophecy), or b) there is something wrong with your engine.

Higher octane fuel is only used in cars that run higher compression or forced induction. It is not necessary for our low-compression, naturally aspirated motors.

[Straight Success]

For the life of me, I could never figure out why my SE always got way better mileage with 93 octane knowing the compression was only 8.5:1 or so (somewhere in that ball park). 'til this day it still puzzles me. I mean, I used both 87 and 93, and I drove the car the same as far as I could tell for months on end. Maybe it was the additives as someone mentioned prior.

Edit: 8.8:1.

[wherm]

I really like to run 93, however all the stations around me are dropping to 91. I run the 91 now, and get around 30 mpg. I'm not highly modified, I/H/E and some other bolt ons with a port and polish and 3 angle valve job. It's just under 200whp.

Even if I'm beating the crap out of my car I never get less than 26 mpg.

[texasvtak]

Even if I'm beating the crap out of my car I never get less than 26 mpg.

this. h22s are the greatest.

[accordztech]

The F22A1/4/6 are designed for 87 octane. The ECU is tuned for 87 octane. There really is no benefit to be had for running anything higher. Chances are, if you see a difference with a higher octane fuel, it's because either a) you're driving more carefully, because you expect better results (self-fulfilling prophecy), or b) there is something wrong with your engine.

Higher octane fuel is only used in cars that run higher compression or forced induction. It is not necessary for our low-compression, naturally aspirated motors.

someone who understands =)