As a rule: driving at low engine speeds lowers fuel consumption and reduces wear.
Use 1st gear to get the vehicle moving. Starting with the 2nd gear, accelerate rapidly. When accelerating, shift up before reaching high engine speeds.
When you reach the desired speed, shift into the highest applicable gear and drive with the engine speed as low as possible and at a constant speed.
If necessary, observe the gear shift indicator of the vehicle.
Use coasting
When approaching a red light, take your foot off the accelerator and let the vehicle coast to a halt.
For going downhill take your foot off the accelerator and let the vehicle roll.
The flow of fuel is interrupted while coasting.
BMW X3 Owners Manual > Panoramic glass sunroof: General information
The glass sunroof and the sliding visor can be
operated together or separately, using the
same switch.
The glass sunroof is operational when the ignition
is switched on.
Keep the closing path clear
Monitor closing and make sure that the
closing path of the glass sunroof is clear; otherwise, ...