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I doubt its anywhere near 313watts. seems awful high. 29% is about 30times too high. car engines are less than 2% efficient IIRC. they are 29% efficient at extracting motion out of the heat of combustion but that heat of combustion is only a fraction of the total energy available in gasoline. or is that 29% how much COMBUSTION energy we get from gasoline? I had assumed when people say that they mean 29% of the atomic energy in the structure of gasoline IE half of what comes out of a matter antimatter reaction so to speak.
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