"To give an example, a petrol engine is like operating a bicycle in its lowest gear where each push from your feet adds little energy to the system, but you still expend energy to move your legs back to the TDC position. A diesel engine is like operating that same bicycle in its highest gear, where each push imparts substantially more energy to the system than in the lower gear, but with the same effort being used to move your legs back to TDC."
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