Is your bike high compression or super advanced timing? If not, why run premium? It's actually harder on the bike to run premium if the bike does not require it.I HAVE definitly noticed a mileage drop from what i was getting this time last year. I was getting 120 miles on the highway at 75 before i had to hit reserve, now i am making about 105 or so. I always buy premium unleaded from QT whenever possible, i don't notice any difference but my bike seems to like the QT fuel.