Just an FYI, it's exceedingly difficult to make a viable fuel that is all three:
a) Unleaded
b) 100 octane or higher
c) non oxygenated
Remember, that oxygenated fuels don't store well.
Remember that oxygenates include ethanol, and other additives.
I'd guess this is leaded race fuel, and as such, will probably store forever. But you may increase the risk of fouling sparkplugs.
There is a very good reason that leaded 100LL Avgas has not been replaced with unleaded. It's so difficult to make a "useful" non oxygenated high octane unleaded, many of us are starting to think it may not be possible.
Sure, you can add 50% Tolune or other component to gasoline to raise the octane. But good luck starting the engine..