Modern motorcycles are designed to run on low octane fuel, so there is probably little benefit and more cost using premium gas.
You might get a little more performance and mileage, but probably not significant.
However, some older motorcycles can be damaged by using the new standard E10 fuel which has 10% biofuel which can attack plastic parts in the fuel system.
Check with the manufacturer.
Premium fuel would overcome this.
Classic motorcycles tend to need premium gas to stop detonation which damages the engine, and may also need an additive to prevent valve wear.
British Superbike School 