The amount of energy required to drive an alternator is insignificant relative to the mass and kinetic energy stored in a moving car. What your experiencing is more a feature of the new generation of transmissions than the regenerative braking. In the newer 8 speed transmission it's much more pronounced particularly in the bottom gears. Much more aggressive than the 6 speed in my F01. Takes some getting use to but it feels more like a manual in the lower gears but you have no clutch to disengage. I think the more aggressive down shifts and full engagement feel of the newer transmissions enhances driving dynamics as opposed to detracting from them. Just my opinion. For a heavy SAV the X6 is a lot of fun to drive.
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