Oh shit, I'm really all over the place in my car. I listen to Prog, Shred, Death Metal, Thrash, ect. I love driving to some good intricate shit. It gives me goosebumps. Sometimes it's hard to listen to grym raw shit production black metal in my car though. For Black Metal something like Graveworm will work in my car, but nothing like Burzum or Ildjarn.
Also, most of my music listening or "absorbing" is done in my car. When I'm home I will play a lot of music from my computer while I'm on it, but it doesn't consume me like it does when I drive.