That used to be me! :-) I worked at one of the last full-service Gulf stations. Other posters are right - mostly cash, you had to do math and make change in your head, keep your bills straight in your pocket... Pump gas, wash windshields, check oil, check windshield washer fluid, quick kick/look at the tires (I can still spot a low tire from 20 yds away)...and yes, enjoy the view of all the young ladies that came in and didn’t want to pump their own gas... Those were fun, simple days. The only bad parts were cleaning out the restrooms - particularly when the previous shift had blown it off, and pulling doubles when the following shift blew off work entirely.
I can still see in my mind’s eye, the pained expressions on my mother and sister’s faces, as they hurriedly emerged from a Gas Station Ladies Room, purses in hand, and the UGH, as they sat down in the car.
Men are different. They can “relieve’ themselves ANYWHERE.
But for women, the Gas Station ‘Rest Room’ experience is still extant, to this day...