Close the windows and glass sunroof
Driving with the glass sunroof and windows open results in increased air resistance and raises fuel consumption.
See also:
Switching off automatically
System switches off: above approx. 9 mph/
15 km/h.
Switch on the system again if necessary. ...
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. ...
Radio
FM
AM
Weather Band
Satellite radio
Stored stations
...