This might be stupid but I see no recommended minimum octane rating for this bike. Another forum someone mentions the owners manual says 91 RON which is essentially 87 R+M/2. I had 1974 Honda and kept ethanol free gas in it and my other bike 2006 Honda 599 has carbs and I keep ethanol free in it. I have a convenient source of 91 octane ethanol free and likely will just use that anyone know of any issues or where RE specifically states a recommendation