Price of gas $$

I have a card that I use, and they take the cash directly out of my checking account. I've used for many years there. $ 3.21 with the card ...I think that they save about 1 to 4 % for me not using a credit card (googled that, for what it's worth, I thought it was 5%) in the area.
You mind explaining what you are talking about?

"This card that I use???????"

I mean, no idea if you are using some fairly common banking card, or a proprietary gas company card that might not even be available over a wide scale?