I will soon be getting my 2010 f 800 GS and I was woundering about the premium fuel requirment. Specially if you do a Mexico/Baja trip. I have a KTM 450 EXC and the book says to use hi octane fuel. I have run both premium and regular and have not noticed a problem, nor have I unpluged the mapping wire. Yes it's carbureted, but high compression is hi compression. I would think a tank of regular fuel now and then in the f 800, if you had to use regular, wouldn't hurt. I wouldn't run regular as the only fuel. There is always octane booster.
If you don't know where your going don't lead!