Just one note, I sometimes ask again when I check in.. I know, with fastrack, five star, Avis First, etc., who wants to do that. but here is an example. Had a rental in MT earlier in the week.. was going to be 176$ for the four days. when I showed up, they put me in a bigger car for 98$ all in. Must have had a lot of cars, or willing to discount. Autoslash hadn't caught it or didn't see the discount that could be provided, but save a tad more than expected. YMMV