As a recent data point renting as Sixt Platinum from SFO for a 6 day rental with a corporate rate.
Location: SFO
Booked: FCAR (Toyota Camry)
Offered & Taken: LFAR (Genesis GV80)
Was curious to try the genesis when it was offered during online check-in so went for it. Had ~1000 miles with AZ plates, so basically brand new. Drove fine, but drinks up gas. Tried to drive conservatively out to Yosemite and Sequoia from SFO and managed ~24 mpg avg I think, but with CA gas prices can definitely sting a bit. Was thankful for the extra space to carry a few bikes in the back with second row seats down, but would opt for a smaller car next time.