Originally Posted by
Fizzer
Until reading these threads I was under the impression that if I "guessed" I needed $50 but only needed $30 the gas station would get to keep the $20. At no time did any single attendant anywhere tell me that I could come back in again and reverse my previous billing to get a $20 credit.
You don't even have to go back in. Your card will only be charged for what you use. The hold will automatically expire after a few days.
When you check in at a hotel, they authorize your credit card for a higher amount to cover any incidentals you may bill to your room. When you check out, you don't have to tell them not to bill you for that amount. It is understood that they only bill you for what you use.