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Also, remember that the F30 has regenerative braking for alternator recharging. When you use Coasting, the car can no longer regeneratively brake since the driveline is no longer connected to the engine belt, where the alternator resides.
(This is one situation that the ActiveHybrid handles a ton better, where the equivalent of "coasting" mode actually turns off the engine, and the electric motor is still connected to the driveline for regeneration and also slight boost)
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