100% is next to impossible if you don't use any internet guides though. I unfortunately had to resort to them, just so I can get all the Mayhem quests and Hidden Items. The only quests I haven't finished yet is the Sunshine Auto ones. But I already finished the game and got the credits, but now I'm going for self-gratification, and I'm going for 100%, non-legitly of course.

Still a great, run of the muck and kill everything game though!