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Diesel engines are becoming the predominant power behind modern tractors simply because they have the highest thermal efficiency of the internal or external combustion engine, due to their higher than normal compression ratio. Unlike gasoline engines, the diesel engines in tractors use highly compressed hot air to ignite the fuel as opposed to spark plugs. I often wonder how guys were even in a position to workout before internet training forums were around. I mean if you fail to visit 469 different forums per day and post the muscles building workout to acquire the approval from the majority the earth's population before going to the gym on that day how will you ever make progress? It's bewildering to me.