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I wasn't flying with the 100LL came to be, but IIRC it was back in the late 80's or early 90's. Even then, it seems like most of the planes, mine included, were rated on 80+ octane. I'm not sure why someone can't brew up some 80'ish octane with a little lead - why does it have to be super refined 100 octane? These 360's and 540's and IO's out there aren't high compression that require octane ratings that high? It still blows my mind that gas for my near 50 year old plane costs more than what they pump into the jets...