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Whenever a clutch pedal is depressed entirely, the car engine is not connected to the drivetrain, so any fuel being used by the engine is being wasted. When a clutch is partially pushed in (engaged), the clutch plates tend to slip, and so part of the engine's power turns into heat (due to friction between the slipping plates) rather than driving the wheels. In either case, only when the clutch is not being pressed at all is all of the engine's power fully transmitted to the driving wheels. So any time the clutch is being used, some engine power is being not getting to the driving wheels, which wastes fuel.

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