I will agree here if there is an extra charge for a credit card it should be posted, or stated, up front. MMany places of business will have a minimum purchase required for a credit card even if there is not an additional charge. I would have to be awfully thirsty before I would try to buy a coke & bag of peanuts on a credit card, to me that is just not what they are for. I fill my gas tank at a self serve station & like to fill up when I pull in. I use a credit card there for convenience, as I don't know exactly how much it will hold. Using the card saves two trips over to the cashier's window, I then pay off the card on a monthly basis to keep from paying interest.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra