See also:

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 ...

Remove attached parts following use
Remove unneeded auxiliary mirrors, roof or rear luggage racks after use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...

Ride & Handling
One of my main criticisms of the regular X5, which was redesigned for the 2007 model year, is its regular suspension doesn't offer the balance between ride comfort and handling prowess that I've c ...