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What is the actual automobile engine efficiency.?

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What is the actual automobile engine efficiency.?

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  1. A typical cycle average value for a gasoline engine is only 25%. A reciprocating engine achieves maximum efficiency when the intake air is unthrottled and the engine is running at its torque peak at around 34% efficiency.

    Efficiency is lower at other operating conditions.

    Diesel engines can average around 35% efficiency

    and can get to a peak efficiency of 42%.

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