I use 76 for these reasons:
1. Grew up around the Union
oil fields
2. West coast staple
3. Stations found (at least used to) around tracks
4. Can still find 100 octane at a few stations (although I think its VP)
5. Only company to give me credit during the lean years
6. Last of the service/repair stations for a major brand
7. Its a penny or 2 more expensive which I LOVE. Keeps the riff-raff away
8. Used to sponsor NASCAR. Whatever good that does. LOL