Price of gas $$

PLEASE no politics, PLEASE ...

Went for gas today at the lowest priced joint around, which happens to be a major car wash in the area. $ 3.54 regular at the pump. 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%) but that is less than 15 cents. When I was a teenager, I remember the station owners in the 60's that I worked for saying they made about 3 cents a gallon, and depended on garage work to make a living. I know Shell made $$40 BILLION last year, but how much is the makeup on gas these days, that I can get $.33 off a gallon. There has to be a lot of people using this card at these places, because they are pretty big in the area.