I just put on a yoshi RS-3 and noticed i had gotten horrible gas mileage. only about 95 miles to the tank. Was this because i need to get my bike remapped or because I put fuel injector treatment in my gas a few weeks ago? Im not riding it hard either. I didnt expect the pipe to loose that much mileage, I actually thought i might gain a mile or two.

 

You won't gain mileage with a slip on. But you won't you won't lose that much either. It was either the fuel injector treatment or something else.

 

I remember buying a similar gas treatment at a local gas station for my nighthawk and running low on gas a bit quicker.
Got the tank and valves cleaned bout a month later and regained my lost fuel mileage.
Dont know much about those gas treatments but I'm gonna guess they are not ment for MC engines?
I guess I'll just keep away from them.