See also:

Head airbags
In a lateral impact, the head airbag supports the head. ...

X5 Diesel in the Market
From a driver's perspective, the diesel X5 is a worthy effort: quick on its feet and agile when it needs to be, yet comfortable for the long haul. Well-to-do families might still give it a look — ...

Remove attached partsfollowing 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. ...