They never know what the stock is going to be like on any given day (unless you’re getting something like a luxury car or a minivan).

I usually rent the compact car (the second smallest/cheapest car). The economy cars are usually tiny, crappy little cars with no room and no engine. The compact cars are usually smaller 4-door sedans like the Ford Focus or Chevy Cobalt that have decent room, gas mileage and oomph. They also tend to be pretty popular so that they might run out and give you a free upgrade (I’ve rented a Chrysler 300 and a giant Jeep, which turned out to be pretty inconvenient, while trying to rent compacts).

thanks, didn’t know that!