Hi all, I'll be going to Disney at the end of July and want to rent a minivan with Dollar (used them before and like them). Using the KISS3 code from Mousesavers, I can get a minivan for my stay for around $310 (not inc tax). I have enough miles for an Amex reward cert for $300 and was hoping to use it to pay for the rental. Now I've been told that I can only use one and the cost with the Amex reward is $560! That just doesn't seem right! What do I do????