When you think of brand name service stations, what comes to mind first?
For most people, it's Texaco, Sunoco, Shell, Getty, BP, Mobil, & Exxon (formerly Esso), the latter pair now united as one conglomerate unto itself. During the 70's, Chevron was a major player as well, if you went by the volume of television advertisements. It wasn't so much the quantity, but the amount of airplay based on the time bought by the company.
Watching Mets & Yankees baseball on cable back in those days, I got to see a few Chevron ads, including this animated gem produced in 1979, and uploaded by Kaibiggins to YouTube. The hook here is that the spot is narrated by radio & cartoon legend Casey Kasem (American Top 40, Scooby-Doo, etc.), who did a handful of these spots.