I'm glad you asked this question,I was about to post the same thing. I use Marine Stabil in my boat and lawn equipment, it is supposed to counter-act the effects of ethanol. The Owners Manual says to have the dealer drain the tank if you let the bike set more than two months, a bit of over kill IMHO.
I'm lucky, here in OK we can still get 100% gasoline without alcohol and that is what I put in the bike when I filled the tank for the first time. Even with 100% gasoline I still use Stabil in everything.