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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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