Ethanol can greatly boost power of an engine, but it's not without its drawbacks.
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 fromThe 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 . The higher rating means greater resistance to knock, the premature detonation of fuel that can damage engines.
The performance advantage of ethanol was shown in a Ford study in which the automaker ran a twin-turbo 3.5-liter V-6 from an F-150 pickup truck on a variety of fuels. That included E85 , the most common ethanol blend, and E10, the 90%-gasoline/10%-ethanol blend that is the default fuel at most U.S. gas stations.
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