I fly a PA28-151, which according to the manual requires 80 octane red, avgas, which I have never seen anywhere. My airplane has a STC for auto gas, which I flew with for many years, but now airports either want to charge a flowage fee or have various rules that make mogas unworkable, so I fly with 100LL and add TCP to mitigate the lead. TCP is a problem because no FBOs stock it, or have even heard of it, so I have to carry a can of TCP, which says on the label that you shouldn’t carry it in airplanes. So, I have a NEED for unleaded avgas. I’d happily buy an STC for whichever unleaded avgas shakes out as the winner, or all of them, just so I could use whatever they’re selling, but no one is selling any unleaded avgas.
I understand the problem for the FBOs. They want to stock only ONE type of fuel. It’s not like stores selling auto gas where they have separate pumps for every conceivable kind of fuel, high, medium, low octane, with and without ethanol, and diesel, and maybe DEF. But at the FBO it’s different, only two tanks, one with 100LL and one with jet fuel, the only one they really care about. I think they’ll end up eliminating avgas altogether. Not enough volume. Fly with jet fuel or just sprinkle yourself with fairy dust, which they don’t sell either.