Why ethanol makes so much power compared to gasoline
Ethanol only contains two thirds the amount of energy of an equivalent amount of gasoline, yet engines make more power burning it than gasoline. This video from Engineering Explained will tell you why.
The key is ethanol's higher octane rating than pump gasoline. Straight ethanol has an octane rating of 109, compared to a maximum 97 octane for pump gasoline (ethanol is usually mixed with gasoline when sold, however). The higher rating means greater resistance to knock, the premature detonation of fuel that can damage engines. That allows engines to run higher compressions ratios and, in the case of charged engines, more boost. In both instances you're looking at increased power.
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