I pulled into the SERVICE station once and asked for $5 worth of gas - just like my dad did. The guy stopped at less than that. When I told him I'd asked for $5 he said, "well, little lady, I can pour the rest of it on the ground, but your tank is full!".
Another time I scrounged in the bottom of my purse and pulled in with an EMPTY tank. Asked for 25 cents worth of gas - would have gotten almost a gallon. I panicked when the little numbers rolled past 25 cents and got out and told the man, "But I only have a quarter!" He stopped it at a gallon - maybe 28 - 32 cents and said, "Yep, and I only have daughters. This'll get you home."
Ah the good old days!