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Kilowatts are really a measure of power, that is, the rate at which energy is being used. It depends on how big your engine is. You could have a tiny, low-powered engine which uses the gasoline up very slowly,or you could have a huge, high-powered gas-guzzling monster, which would use it up fast.

What you really might be asking, however, is "what is energy content of a gallon of propane?". Energy is measured in Joules. A joule of energy will keep a 1 Watt engine running for 1 second.

If you ask: "How many kilowatt-hours of energy can an engine get out of a gallon of propane?", that would depend on the efficiency of the engine, which could be as low as a few percent.

Wikipedia states: "When properly combusted, propane produces about 50 MJ/kg"

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16y ago

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