E85 has about 27% less energy per gallon than E0, E10 has about 3% less energy than E0, E15 has about 2% less energy than E10. The 2 FFV cars's I've owned got 18% less mileage on E85 than E10, per the energy numbers they both should have been worst. Energy per gallon isn't always = to energy output. So with them E85 has to be 1/5 less expensive to = E10 $/mile. (never ran E0 in either)
With the Stratus I've blended into the 30's and with it energy in = energy out (non FFV car). (numbers in another thread, search E85 for a few hours worth of reading).
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