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Thus a diesel engine's efficiency = 1/(BSFC*.0119531) and a gasoline engine's efficiency = 1/(BSFC*.0122225)
This is not true. Engine efficiency relates the power out to the power in. The calculations above use the lower heating value of the fuel and thus overestimate efficiency by assuming there is less energy in the fuel than there really is.
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It would be clearer if the first calculations used SI units rather than kW-hrs etc, as that complicates explanation of a simple concept.
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Some examples of real engine efficiencies would be good.