I have put up to 25% ethanol in my car and when I did that I noticed no difference in milage People on that forum are using E85, some with less than a 10% drop in milage. Nearly all with less than a 20% drop There could would be very little to no difference in milage if people would build more engines optimized for E85.(I realize that is not practical until more stations come online, however.)

And by the way, How could you lose 10% of your milage when the fuel is only 10% ethanol. That would mean the ethanol had NO energy. Either that or something is wrong with the car to not adjust correctly.

I also agree that the money for ethanol is going to a much better place than the money we spend on gas/oil.