Hi Bjoern,
A rental with Dollar in Orlando (not MCO, but other location on Rt. 192) landed us a red Dodge Charger. We had actually booked a mid-size (
www.billiger-mietwagen.de), and were upgraded to the full-size Charger. After the first week's rental we began a second rental booking (first was with additional driver, second rental without) and planned to trade cars at Dollar on International Drive. The mid-size that was again booked would have been a PT-Cruiser, but we were allowed to keep the Charger anyway (although the CSR didn't seem very happy to do so).