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Why are diesel engines more efficient than gasoline engines?
How does a higher compression ratio lead to more energy extraction?
The higher compression ratio increases the temperature and pressure inside the engine's combustion chamber, which allows the diesel fuel to burn more completely. This leads to a higher expansion ratio during the power stroke, which means more work is done with each injection of fuel. In contrast, gasoline engines typically have lower compression ratios and require a spark to ignite the fuel, which limits the amount of energy that can be extracted.