shouldnt make a great deal of difference to a stock bike, car, boat etc...
the higher the octane, the better the burn though. when you have mods on them thats when its more noticeable. more reliable burn. claims of better economy but who the **** knows... just ride till it needs re fueling...
don't put that e10 crap in ha ha. I put it in my mates bike as a joke to see what would happen and now she wants to murder me as the damn thing won't run...