Ford Fusion at TUS
Rented from National at TUS last weekend and got a Ford Fusion from the Emerald Aisle (well, technically no Emerald Aisle service in TUS). Noticed a bunch of Malibus and HHRs and then the Fusion. Asked the booth attendant and was given it without a problem.
As others have mentioned, in TUS you have to check in with the booth attendant in the garage to get your paperwork, but you can bypass the in-airport counter.
I was pleasantly surprised by the Ford Fusion...roomy, decent power, and it looked halfway decent from the outside. Had Sirius as well...a nice bonus!