See also:

Close the windows and glass sunroof
Driving with the glass sunroof and windows open results in increased air resistance and raises fuel consumption. ...

Tire inflation pressures X5 xDrive50i with two rows of seats
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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 ...