[DarkObsession]

Originally Posted by Alec

Lot of misconception floating around. Since e85 is about 110 octane, you can run much leaner AFR's and much more timing without detonation. I've noticed E85 only requires about 30% more fuel on the camaro, not 50%. When I tuned Milkmans car, I kept the cruising AFR's a tad on the lean side to help the fuel economy loss. AFR's under WOT are around 12.5-12.7. Since we were tight on time, I was only able to advance timing about 5 degrees, plan on advancing it an additional 5 degrees when I get a chance. You can't run that much timing on pump gas with zero knock

This actually has some misconceptions of its own. E85 is only about 95ish effective octane, not 110.

The real benefit is the cooling effect on the engine. It doesn't detonate as easily because of its cooling properties, not octane rating.

And I agree with some other points in this thread: unless you are running much higher compression or insane amounts of timing, E85 on NA doesn't make a ton of sense. If you are boosted, then yeah, you are going to see a pretty big gain.