I just bought a 2015 Honda CBR 500R. I haven’t filled it up yet since the previous owner had it full when they sold it to me. Do I fill it up with regular gas? Like 87? Or premium, 91-93? thanks

Okay, so I recently decided I am going to sell my 2002 KX-60 because me now being 6'2 160lbs, it's safe to say that I've outgrown it substantially. However, It's been sitting in the dark part of my hangar for the better part of 3 years without running, and I'm afraid that the gas has gone stale...