In the context of efficient driving in heavy vehicles, what does the so-called "green zone" of the rev counter represent?

Question

DentroTest · Accepted Answer

The rev counter or tachometer shows the revolutions per minute (rpm) at which the engine turns. In heavy vehicles, this instrument usually includes a band colored green (the "green zone"), which marks the engine's most efficient operating speed. Driving within this band makes it possible to take advantage of the torque and reduce fuel consumption and polluting emissions to a minimum. The accelerator pedal has no marks or delimited zones of this type, so one cannot speak of a green zone on its travel. And the odometer measures the distance covered by the vehicle, not the engine speed or an economical speed.

In the context of efficient driving in heavy vehicles, what does the so-called "green zone" of the rev counter represent?

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