OK here is a bit more for the motor heads out there.
G100UL typically exceeds the min spec for avgas by quite a bit, MON99.5. As this test sheet shows over MON101.
So have a look at the comments at the bottom highlighted. That should put a smile on a big turbo radial owner, things that like a lot more boost than 100LL will permit
And for the folk who need a (R+M)/2 number that is a bit better than average check this out
Now compared to the BP 98 Ultimate that many racers etc have easy access to which has a RON=98 and MON=86 you can see why the avgas was popular. And the (R+M)/2 is 91 compared to over 105.
So yes the petrol heads will love this stuff and it will be a legal UL fuel to use. Of course you need an engine to be built accordingly to take advantage of it.
OK back to topic.....Piston twins assuming fuel is not an issue. An Aerostar
..... now where is our mate UTR. He seems quiet.