See also:

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

Remove attached parts following use
Remove auxiliary mirrors, roof or rear luggage racks which are no longer required following use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...

Diesel Power
Drive a diesel and you'll likely notice the characteristic extra power when you're pulling away from a stoplight. That comes from low-end torque diesels typically produce. The X5 xDrive35d has a h ...