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Let me try this again. It's been a while since I took Physics.
According to Physics and its Unit Conversions, ~2500 BTUs/hr equal one horsepower.
If you burn one gallon of ethanol and gasoline in an hour,
Gasoline = 114,100 BTU or 45 HP
E85 = 81,800 BTU or 32.72 HP
Therefore, to acheive the same performance you need to burn more ethanol.
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