I really like pre-paying at the pump. True, there is a card dollar limit of 75 to 100 dollars most places, but I manage that by just swiping the card again, and getting two receipts from the pump. My rig is gasoline powered, and even though it has a 75 gallon tank, I try to fill when it is around 1/2 tank or just below. I can usually get it full with two swipes of the card that way.
The biggest hassle I have is, as stated above,are rude people who haven't a clue, (really feel like running over some of them at times)
and getting my rig in and out of some of the stations that are a pretty tight fit. The term "RV friendly" takes on a whole new meaning at some of the places I have fueled.