I just finished a 3 day rental at LAS. I originally booked a midsize National EA car, but then cancelled and rebooked to a premium at alamo as it was cheaper. I got to the lot and didn't see an EA or ES area so I don't know what was there. The national and alamo cars are all together. In the premium area there were 2 chrysler 300 tourings, 3 base chargers, 3 avalon tourings, a taurus limited and 3 maximas, one of which I took.
This was at 10am on friday. I dropped off at 8pm sunday and there was nothing in premium that I could see. I only saw midsized and vans in their desinated rows.
I picked a great car. The maxima was ther perfect rental for the 3 adults in my party and on a small road trip to the hoover dam we got 28.2 mpg. But driving around the strip we got around 12, but thats alot of STOP and go with the air at full blast in 100 degree heat.