Hi GoNavy:

___One of the problems w/ E85 is that the FFV makers cannot design the engine around it. Given the high octane, they could be running closer to 12.5:1 vs. 10:1 before pre-detonation. Since gasoline is the prevalent fuel, that is not going to happen. I do have to wonder how much of the FE hit you could get back while running an E85/100 designed ICE at 12.5:1 instead of an E10 designed ICE at 10:1 on E85?

___Good Luck

___Wayne R. Gerdes