according to BMW's official specs: weight difference between 550i and 550i xDrive is 199-lbs, 435i and 435i xDrive is 125-lbs, 2014 X5 sDrive and X5 xDrive is 110-lbs. They better figure our how to make the xDrive unit lighter, and put the cars on a diet...as it has been rumored, they they will be using a lot more Carbon-fiber, CFRP and aluminum. Like the upcoming M3/M4 .
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