DPoV what mixture of ethanol are you using?? i had a chrysler T&C (flex fuel) and i ran e85 on it and didnt see that much of a loss (maybe 2mpg), as is any modern vehicle should not see much of a difference on e10.. but if your vehicle is not calibrated for e85 and you try to use it you will have a huge difference because your computer will read the exhaust as being lean and will dump more fuel in to compensate for the perceived lean state.
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