I also remember that on Saturday nights we would go to my friends Sunoco station and he would turn the dial past the Sunoco 260 mark so that we were getting super hi test , something like 270. It was great racing fuel for our little Saturday night street races.
We called that... white gas... because it was clear unlike other brands that were colored by additives! My brother-in-law had a '69 Z28 (4-speed) & that gas would really perk his car up!
BoB