Correct answer
Adjust the engine revs so that, when changing gear, they settle at the start of the green zone.
To drive efficiently, you should change gear at the right moment so that, after the change, the revs settle at the start of the green zone — that is, so the engine neither revs excessively nor loses power.
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Adjust the engine revs so that, when changing gear, they settle at the start of the green zone.
Adjust the engine revs so that, when changing gear, they settle in the red zone.
Adjust the engine revs so that, when changing gear, they settle at the end of the green zone.
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