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The 2014 BMWs equipped with a ZF 8 speed transmission support a special coasting mode where the transmission disengages the engine (e.g. goes into neutral), the engine drops to idle speed, and the car coasts.
This allows you to lose less speed when coasting, which may prevent you from needing to hit the gas again.
Normally, the transmission back drives the engine while coasting, downshifting to keep the engine above 1000RPM. In this mode, no fuel is injected to the engine while coasting, at the cost of higher frictional losses and hence your car slowing down quicker.
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