IC engine efficiency is measured in Brake Specific Fuel Consumption. A lot of words, and a lot of graphs, and a lot of work has been done on this over the years. tractor, car, truck, train, pump, doesn't matter what it's driving, a fuel efficient engine has a low BSFC number.
There are so many variables it's hard to even put a dent in it. The thermodynamic limits of a gasoline engine are about 14:1 compression with good quality hi octane fuel.
Best modern IC engines get about .36 BSFC in the auto world.
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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