The B9's drag coefficient value of 0.23 is class leading, and is derived from a range of subtle measures, including the outer lines of the air inlets that integrate additional openings (they guide some of the airstream over the wheel well), wing mirrors positioned on the door
sills (
narrow stripes enhance aeroacoustics, amber light below it is a unique blind spot assist method),
narrow trim on the rear
windows and a largely smooth underbody.
If a cat likes to sleep on
window sills or other
narrow platforms, it is advisable to place a soft padded object on the ground underneath to prevent injury, as many older cats have impaired balance and could easily fall; ideally, elderly cats should be encouraged to use secure or wider surfaces for sleep.