I remember 15y-20y ago when it was becoming a trend to fuel your own car, some gas stations had two prices. One for "self service" and one "served". I believe t

I remember 15y-20y ago when it was becoming a trend to fuel your own car, some gas stations had two prices. One for "self service" and one "served". I believe that majority of people were trying to avoid tipping the attendant (imagine tipping £€1 for a £€10 fill, that's 10% tip).