See also:

Central locking system
The conceptThe central locking system functions when the driver's door is closed. The system simultaneously engages and releases the locks on the following: > Doors > Trunk lid > Fuel ...

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

Have maintenance carried out
Have vehicles maintained regularly to achieve optimal vehicle economy and operating life. Have the maintenance carried out by your service center. Please also note the BMW Maintenance System ...