I was expecting more negative comments. My machinist says he's running 13.5:1 (not a Pontiac engine) using E85 and loves it! He says it really helps keep his engine cool.
How so? Typical exhaust gas temperatures on a properly tuned engine run between 1100-1400 degrees and can go as high as 1600 degrees depending on how much of a load is on the engine. Temperatures don't vary more than a few degrees from gasoline to alcohol to be running at a proper air fuel ratio.
