I faxed the reservation confirmation from priceline to AVIS. It took 24 hours for the fax to appear in AVIS system. Now they said they have refunded all the extra money back to my credit card. If you reserved the car for over night 1 day, and you returned the car same day, you may get into trouble. AVIS will charge you at a ridiculously high rate. This should apply to multi-day rental as well. For example, if your reservation said you are going to keep the car for 5 nights, but you only kept the car for 4 nights, you are in trouble. You may still be able to get back your money, but only after a painful fight. When you pickup the car at AVIS, AVIS will ask you to sign a paper, at the bottom-right corner, there is a line saying "IF I RETURN THE CAR PRIOR TO THE DUE IN TIME SET FORTH ABOVE, I MAY BE CHARGED A HIGHER RATE." Is AVIS changing the contract between me and priceline? The refund hasn't appeared on my credit card yet. I will report again if there is some money left un-refunded.