BMW 5 Series: Close the windows and glass 
sunroof - Saving fuel - Driving tips - BMW 5 Series Owners ManualsBMW 5 Series: Close the windows and glass sunroof

Driving with the 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. ...

    Check the tire inflation pressure regularly
    Check and, if necessary, correct the tire inflation pressure at least twice a month and before starting on a long trip. Low tire inflation pressure increases rolling resistance and thus raises ...

    See also:

    Other fluids and lubricants
    ...

    Low Oil Pressure Indicator
    Low Oil Pressure Indicator This indicator should never come on when the engine is running. If it starts flashing or stays on, the oil pressure has dropped very low or lost pressure. Serio ...

    How to use the Vehicle Information Display
    Press the button, located on the instrument panel just behind the steering wheel, to display the following modes: MPG→ MPG/MPH → Time/Miles → Range → Exterior Temperat ...