Personally, I feel E10—or even worse, E15—is the work of demons. During the heat of summer it facilitates fuel percolation, reduces fuel efficiency, separates the liquid, increases the cost of fuel, rots fuel system components, misuses food-producing farm land and even worse, its whole emission-reduction value is in question. Now that I've gotten that off my chest, I'd like to add some helpful tips. I have been using StarTron in my bike since March, and it has performed very well. I mix it at one ounce to six gallons of E10, at a fuel fill-up. Campmor sells one ounce Nalgene bottles which aren't affected by the StarTron (an enzyme fuel treatment —Ed). I can easily carry two of these bottles under the fuel door on my GL1800, enough for a day's ride.