In Australia when we fill up with petrol (gas) we just start pumping into our car. Then we go into the store and pay for it.
In US you have to first go into the store and prepay for petrol (gas), then fill up your car and then go back into store to fix up the difference.
Why is there a difference?
Varies from place to place. In nicer places you pump and pay. In other areas it's as you describe.
Though mostly you pay at the pump. And then pay again inside if you want something else.
But yes, the difference is the demographics.
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