Correct answer
An engine-speed range indicated for economical operation.
An engine-speed range indicated as suitable for economical operation under manufacturer guidance. The rev counter measures engine speed, whereas the odometer records distance. The green zone guides the operating range; it does not by itself guarantee minimum fuel consumption under every load, gradient or situation. Suitable gear and road speed also matter.
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An engine-speed range indicated for economical operation.
A distance-travelled range shown by the odometer.
The accelerator pedal travel that always guarantees minimum consumption.
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