You are right about the vacuum reducing the efficiency of a gasoline engine over a diesel. They used to have contests where guys would compete to see which car and driver could get the best miles per gallon of gas. This was a long time ago but even with older cars they were getting fantastic mileage!. One of the tricks that they used, was to hold the throttle wide open till they got up to speed and then they would shut the engine off and coast. They would do that over and over. That would let the engine be just as efficient as a diesel except for the higher heat value of the diesel fuel. You could never drive like that on the highways but I thought it was interesting.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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