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Originally Posted by 1999 White C5 Coupe
E85 fuel contains about two-thirds the energy of non-ethanol unleaded gasoline (gallon for gallon).
What is rarely discussed is that vehicles designed to run on E85 fuel get significantly less mileage using E85 fuel compared to using non-ethanol unleaded fuel (or fuel that has 10% or less ethanol).
Why would anyone want to convert a vehicle to run on E85 fuel and reduce their fuel mileage significantly?
GM is touting the number of new vehicles designed to run on E85 fuel, but the company does not talk about the reduced mileage.
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Actually it isnt that big of a mpg drop, and if its sold cheaper like $2 vs $3.30 then it doesnt really matter. That and what shadams said is true if you have a high compression ratio