Always keep hearing protection in your vehicle, too. Preferably the electronic kind. Ear plugs for any passengers.
I do.
IMHO, unless your car is physically unable to move (crashed, trapped by blocking vehicles etc), it’s a much better weapon than a pistol fired out of or through a window. Head down, hammer down, your vehicle/weapon also gets you out of the ambush. Both hands on the wheel, duck, accelerate. Unless your vehicle is pinned and unable to move.