See also:

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

Torsion-resistant body, optimal weight, wide range of safety features
The new BMW Series 1's lightweight body makes it more agile and improves passenger safety, with high-strength steel being used to increase torsion resistance and the strength of the passenger safe ...

Reference
This chapter contains technical data, short commands for the voice activation system, and an index that will quickly take you to the information you need. ...