I hope you all don't mind me reading over here. It's so interesting to hear how others live and shop.
California did away with pumping before paying years ago as people were taking off without paying. I think you can still pump first in the middle states until about Arizona where it's a pay first.
Most people I know have figured in their head about how many gallons they need, round it off to the nearest dollar (3.84 a gallon, $4 a gallon x needs 10 gallons= $40). I know I always try to figure a little short so I don't have to go back in.
On a trip to Detroit years ago, I had to go over the border to a grocery store to see milk in bags LOL Human nature I guess to see things that aren't "normal" to you. It always has amazed me how many times I have heard that there isn't that many flavors/brands, etc there. With the US, it's marketing and all marketing with more and more.