I use Shell "race" fuel: 93 octane, ethanol-free available via the pump at a specialty fueling station that also pumps 91 and 98 octane, ethanol-free fuel and sells the 5-gallon cans of the 110 octane race fuel.
My bike is mapped/tuned for the 93 octane ethanol-free fuel with an aftermarket race filter and full Termi system; however, the engine is mechanically stock.
Bike is track-only.