Didn't know if this post should go here or in the general forum but, like for a lot of us, motorcyling is a seasonal thing in my part of the world. Living in the midwestern U.S. means that your bike is put up and not ridden for at least several months a year, maybe as much as 4 or 5 months depending upon how well you can tolerate cold weather riding. As most riders (and car drivers) of vintage machines bemoan the ethanol blended fuel available nowdays, its' use, by itself, is bad enough, but when you have to leave your bike sit for a good part of the year, it sort of compounds the potential for fuel related problems. I, like I would assume a lot of people do, I use a fuel treatment intended to add to ethanol gas to reduce or hopefully eliminate those problems. Although, there are many various brands of products, I usually use Sta-Bil brand fuel treatment. A small amount of this product, will treat many gallons of fuel. My question is, is there any downside to using these types of products? I usually stick very close to the recommended dose of treatment to gas, but, again, is there a downside to overdosing with these kinds of products? I don't know that there are any petro-chemical engineers here, but does anyone here have any info on whether there are any negative effects of these products use? Maybe it's just my imagination, but it seems like I can tell a difference in the exhaust smell when Sta-Bil is being used in the fuel.