He is going to the track to prove it. Like someone else said, I don't care about mpg. I care about performance. E85 gives you ability to run 105 octane with a race tune all the time for the price of regular gas. Race gas is $10+ as someone stated, so there is significant savings. My only concern is the long term effects and damgage to the fuel system, which there seems to be no conclusive evidence. Props to Bikecop for being the test pilot and hopefully it all works out.