Diesel engines have been around since the late 19th century, which was around the time Karl Benz built the world’s first automobile. Diesel engines have higher compression ratios than gas engines and typically produce more torque. Regardless of fuel type, all engines lose some of that fuel’s energy as ambient or exhaust heat. The amount of potential fuel energy that’s actually converted to motion is called an engine’s thermal efficiency.  The thermal efficiency of diesel engines has typically maxed
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