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Freewheel Function

Freewheel Function

The freewheel function enables the vehicle’s kinetic energy to be utilised to better effect.

In the zero-load state (foot off the accelerator) the clutch is automatically disengaged and the engine is held at idling speed. As a result the vehicle can coast for a distance that does not subsequently have to be covered by the use of fuel. The benefit in terms of fuel consumption in practical usage on the road stems from the fact that the vehicle’s kinetic energy is only used to overcome the rolling resistance and aerodynamic drag, and no longer to keep the engine turning at high speed on the overrun. If the driver indicates a wish to slow the vehicle by pressing the brake pedal, the clutch is engaged once again in order to utilise the overrun switch-off effect of the engine; the fuel supply is interrupted and the engine braking effect once again reduces the overrun distance of the vehicle. Alternatively the minus button on the steering wheel can be used to the same effect.

The savings achieved in this way can in some cases amount to 0.5 l/100 km and more. The efficiency of this function depends on a predictive driving style; after a brief familiarisation period the driver will have adapted to the longer overrun distance of the vehicle and will intuitively lift his foot off the accelerator earlier when approaching a built-up area, for example.