See also:

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. ...

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

Sitting safely
The ideal seating position can make a vital contribution to relaxed, fatigue-free driving. The seating position plays an important role in an accident in combination with: Safety belts. He ...