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It has nothing to do with hybrid technology.
Like the 730d and indeed all Efficient Dynamics models, it uses regenerative braking. This means that it delivers full power when accelerating and charges the car's battery only when braking or going downhill (when not accelerating).
Apparently this can deliver 3% boost in energy efficiency, which can all add up!
Luke
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My favourite game: trying to get 700 miles out of a tank of diesel...
BMW 520d (F10)
BMW 730d M Sport (F01)
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