Recently the official EPA fuel economy web site started showing the new more realistic mileage numbers based on the updated 2008 procedures along with the older numbers. They have also added extra mileage ratings for flex fuel vehicles that show what drivers can expect if they actually filled their tanks with E85.
As expected, the running on E85 drops the mileage by about thirty percent compared to gasoline, since ethanol only has about sixty percent of the energy per unit of gasoline. Running on ethanol also lowers the range of the vehicle as well as the power output unless the flex-fuel engine is turbocharged like the Saab Biopower engines (which aren't available in the US yet)

[Source: EPA]

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