Ok, with Merri's assistance I've come up with the perfect plan!
First, you must get ahold of some explosives. Next <insert brilliant plot here> blow up the place you got the car from, destorying all records.
Providing you don't want to kill anyone, you will need to kidnap the person that rented you the car, and hypnotise them, erasing all memory of yourself from their mind.
Next, change your name, paint the car, and move at least 2,000 miles away.
Hey, it could work.
Edit: Somehow I missed the "legal" part of your post. Isn't it only illegal if you get caught?
Edited, Tue Jan 6 23:53:49 2004 by Angua