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I find a BTU chart:

Propane 1 gallon = 91,500 BTU 1 cubic foot = 25,000 BTU 1 pound = 21,500 BTU 4.24 lbs = 1 gallon 36.39 cubic feet = 1 gallon Natural Gas 1 cubic foot = 1,050 BTU Gasoline 1 pound... Login to read more.