If you go to any SPinx stations they all cut off at 50$ for Credit Card and 35$ for debit card, if you go to Phillips 66 they cut off at 50$ for debit and 75$ for credit card. I checked with both corporate offices and their thinking is that it protects them from fraud.....I don't know about that but when I am filling up a 38gallon primary and a 100gallon secondary I don't want to be stopping at 50 and passing the card over and over and over , you get the picture.....