What car was reserved and what was provided?

I've reserved a Green Collection car and been given a regular car. In cases like this, where the difference is pretty negligable, I haven't made a huge deal of it. Yes, a Toyota Camry gets better gas mileage than a Taurus but it isn't a significant change. If, however, I reserved a Prestige Collection car like a Volvo or Audi and ended up with a standard car by all means I'd make a huge stink about it.