Maybe that's when you're an executive level in their rental program. 1 free day for every 5 rentals isn't bad at all. I wish Marriott equated the same...1 free night for every 5 stays.

You can't beat their free day either...basically its any car you want except a major luxury car. Minivans, Suburbans, all work.

You also can't beat just walking on to the National rental lot and picking pretty much any car you want as well as an Executive in their reward program.