Due to greater compression ratios and higher burning temperatures the diesel engine has a thermodynamic cycle that is basically more efficient than that of the gasoline engine. Then it uses less fuel per unit of power produced, but in order to do this it needs more space inside the cylinders to make the best use of the more extreme pressure and gas expansion characteristic.
Consequently, when the two engines being compared have the same volumetric capacities, than the amount of power of the gasoline engine is more, but it takes more fuel and a greater heat loss to achieve this.
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