My Saturday job as a 16 year old was on a staffed forecourt on the A1 north of Newcastle, a few of my school friends worked at the same place. We made a fair amount in tips cleaning front windows, of course most 60s cars didn’t have washer systems. It would possibly surprise modern drivers how much oil we sold as well, older engines seemed to use so much oil it was still fairly common to be asked to do an oil check during a fuel stop and stick a relatively small amount in the car, I expect the markup was huge, as we would sell at least the minimum bottle size, any left over went in a drum…
I also think in 1970 we had a strange setup on the pumps. The pump could deliver 5 different octane grades, but they were mixed depending on a rotary setting on the pump, which had 2 feeds from the tanks, 2-star and 4-star. So effectively if you wanted 3-star you got a 50/50 mix of 2 and 4 star. But the odd thing was you could also set up the other unlabelled mixes, ie 75/25 or 25/75. But they weren’t advertised. I remember getting warned by the grumpy sod behind the till after accidentally putting a wrong mix in someone’s tank, I suppose it was 3.5-star, that I’d have to pay if his engine was damaged. Total rubbish of course…