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It varies somewhat depending on engine design, but a gasoline engine is approximately 30% efficient due to heat, mechanical loss, etc. Despite modern engines getting about 98-99% efficiency out of the gasoline.

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Q: What is the combustion efficiency in an automobile engine?
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Related questions

What is difference between ic engine and automobile engine?

Automobile engines are ic (internal combustion).


What did the development of the internal combustion engine bring about?

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Engine Power! Internal combustion engine.


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The Cooling System.... <3


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