When I rent a car for travel I like to try a car I don't own or one that I might like to own, and I like it to be low mileage so it feels like a new car. Doesn't everyone? I Rented an economy car through Costco for use in Las Vegas. During the rental it offered me to upgrade for a few dollars more to a mid size Ford Fusion. I wanted to try a Fusion so I went for it. After arriving in Las Vegas, the Alamo counter person asked what kind of car I wanted. I told him that I wanted the Fusion and the ad from both Alamo and Costco showed that vehicle for my reservation. I got out to the lot and told the lot attendant what I wanted. Of course no Fusions were in the lot, not a one. No explanation or alternatives offered, just no Fusions. Plenty of Chevy impalas, hyundais, and Nissan altima's. I took the Chevy which had almost 30,000 miles on it. It was like borrowing a car from a friend, not really like driving something new and at the same time hoping that it wouldn't break down.
Don't rent from Alamo or use Costco for travel rentals. Neither knows how to deliver what they offer. Spend a few more dollars and go with hertz or Avis. It will be with your while and you will get what was promised.