I fly airplanes too. You don't want avgas, at least not 100(green) 100LL (blue) or 80 (red). If you happened upon some 94UL, which is basically avgas without any lead in it, your bike would probably like that stuff. It is mostly alkylate, which is the best fraction from refining gasoline. Burns clean, has a high detonation resistance, has high thermal content.
Trouble is, it hardly exists. I think you can get it in a few places in Europe. But it is rare, rare, rare stuff. You'd have better luck looking for 200 year old cognac.
Never been to a Starbucks.
2009 Suzuki Burgman 650
Matches my purse.