Right now I just carry a keychain multi-tool knock off on my belt. It has a flashlight which will be helpful at night with my car problems. I have a Kershaw Ken Onion Spec Bump on the way and I may get a Kabar TDI small size one of these days as well.
I carry a 3 inch Gerber tanto i picked up at walmart. Pretty good little knife and does everything I ask it to. There are better knives but there are more important things to me than a 100 dollar pocket knife. I love Jeeps more than guns and knives!