Anyone use the HD Fuel additive. They say on the HD website that it allows use of a lower octane fuel and reduces carbon buildup. It costs about $4.00 to treat 40 gallons, thats 0.10 per gallon. I figure it shouldn't hurt to use it, but what octane gas can be used.

 

i use the stuff in my ultra and it works well. you will notice a slight power increase. i dont use it every fill up. every third but i still use premiun fuel.