like many stated, to many variables between different cars and engines to give an accurate MPG loss with e10. it will effect some more than others.
now, e85, will drop MPG compared to e10 or e0 in any car. but, if your car is tuned for it, and the fuel system can handle it, you can have major performance increases. A buddy has a turbo charged Cobalt and runs E85, makes over 400 WHP with it. if he tuned on straight gas hed be making a lot less.
that being said, Im not a fan of ethanol at all mostly because i ride a 2 stroke sled and its hell on them things. even my carbed 4 stroke quad, I have to drain all the gas from the carb before putting it away for the winter or it will just make a mess in there.
__________________
|