Swift also has 94UL which I believe all the Cirrus aircraft are certified for and I imagine most of the other high performance turbos could get an STC for. There's also the mogas STCs if we could drop the stupid ethanol corn subsidy. Personally I'm currently working on an EAB that will run E10 without issue because I'm so sick of the 100LL shit. There's a LOT of lead in 100LL (despite the name) and aircraft operations naturally expose you to a lot of it.
I mentioned Swift as well, but don’t think they have as good a chance to be an all-fleet fuel.
The Cirrus factory turbos are low compression engines (7.5:1). That gives a greater margin against detonation (at the cost of efficiency). That won’t extend to 8.5:1 compression, big-bore engines near as easily, whether turbo or normally aspirated. (This also means that I doubt it will work in the Tornado Alley turbo-normalized Cirrus.)
I too want to get the lead out of my life, especially since my kids fly in the airplane and are going to have exposure to it incidentally, even as I try to minimize it. It may well end being faster to just make more money and switch to Jet-A than to wait for a viable unleaded fuel to take over the market.
