See also:

Remove attached parts following use
Remove unneeded auxiliary mirrors, roof or rear luggage racks after use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...

Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 wou ...

Safety
As of publication, the X6 hasn't been crash-tested by the Insurance Institute for Highway Safety. The SUV comes with a number of standard safety features, including antilock brakes, side-impact ai ...