I was inclined to think that all manufacturers put up the best possible stats for the cars (gas milage, 0-100 speed etc,..) becuase that helps to sell the car more! I bet they came up with 6.4 sec. with vehicle barely having any options on the car and on a minimal amount of fuel on board with a 130lb professinal driver who is trained to shift exactly at the torque peak, you know, things of that sort.

By the way, please don't be hurt when other cars pass you, they just have to show off by driving like that when we, the x5 owners, can ride at our own pace and still be respected. Besides, if not getting passed is your thing, should've got an M3 not an x5.