What Octane do you use?

[powerslave1966]

Ok, so I filled up at Sam's Club after returning from work with 93 octane today, got 44950 miles on the mileanometer, let's see how this goes....

[strokeZ]

I run only 89 or better. WanderingT's - 30 cents is not nearly enough of an offset to justify E85. I experienced an average 2mpg decrease with E85 when I decided to test it out. So back when 89 octane was running $3.00, I calcuated that E85 had to be no more than $2.40 to justify. Now I did feel a lot better throttle response with E85, but I am sure that was becuase it has a 105 octane rating. E85 is great for cars specifically designed for it bc the exhaust temps are cooler so you can theoretically crank up the compression and actually get more HP, but Flex fuel cars don't do that, they just change the firing, etc. Make sure that if you DO test you go through at least 2 to 4 tanks for the electronics to fully kick in.