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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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