I remember the 60s Sunoco 260 fuel being 102 or 104 octane and the 280 Sunoco fuel being around 108-110 octane. Course this was leaded fuel too. And that was a RESEARCH Octane Number
Info:
"A numerical representation of the ability of a fuel to resist knocking when ignited in the cylinder of an internal-combustion engine. The octane number of a given fuel is determined by comparing the amount of knocking that fuel causes when combusted with the amount of knocking caused by two standard reference fuels, isooctane (which resists knocking and has an octane number of 100) and heptane (which causes knocking and has an octane number of 0). The octane number is then assigned as the percentage of isooctane required in a blend with normal heptane to match the knocking behavior of the fuel being tested."
Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught
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