Heres my opinion on "car" girls.
Theyre cool, but usually not worth dating, at least in my town. The same small number of girls date the same larger number of guys. Everyone knows who everyone else goes out with, and it turns into a mess, or at least it can turn into a mess... nothing ever dies, and the same drama always goes on, same people, just different partners... yuck.
I dated a few of the "car" girls, and had some fun, but it never went anywhere, since all the other guys were always competing with me for their attention...
On the other hand, it is fun to talk cars with a girl, and it is a bit of a turn on to meet a girl with a turbo larger than yours.

But ive learned my lesson...to stay away, at least on the relationship/dating side of things.
Either that, or the girls who hang around car guys are just stupid bitches who think we have money because we drive nice cars.
Thats why i found someone OUTSIDE the car scene. She thinks its cute that i like cars, and she likes my car, but thats about it. Shes like "whats a turbo?"
edit: /me puts on flamesuit