'Way back in the early 1970s when I got my private pilot's license, 80/87 octane aviation gasoline was "red" and was used in light general aviation aircraft like the Cessna 150 I owned at that time as well as Cessna 172s, 182s, 210s and most Piper and other light General Aviation aircraft.
During the late 1970s and early 1980s, the av-gas fuel companies began phasing out 80/87 octane Red and High-Lead Green... replacing both av-gas fuels with 100 octane Low Lead Blue.
In 1978, I sold my Cessna 150 and bought a Rockwell Commander 112 which had a 200 HP IO-360 Lycoming, fuel-injected engine which required 100 LL fuel. By then, 80/87 Red was getting hard to find at a good many airports.
We had several drag-racers coming out to our smallish country airport with gas-cans to buy 100 LL Blue for fuel for their highly-modified drag-race engines. However, such transactions were considered "illegal" by the Federal & State governments due to the fact
no highway-use tax was charged on av-gas as compared to mo-gas (automobile fuel).
Of course, like so many during Prohibition, neither the buyers nor the seller (the airport management) ask, mentioned or took notice in WHAT type of "aircraft" that av-gas was gonna be used.
Jus' my 2�...
Strength & Honor...
Ron T.