Copo you work with this stuff every day so I'm not even pretending to know more than you. The stuff I use is what Hodgeson' put me on years ago, I don't think they sell it anymore and use something a little different, it's probably kind of similar, the price is at least. It's Octi-Plus made by Well-Worth, which is also made in buffalo, I wonder if they are the same company? As luck would have it, the distributor lives right around the corner from me and I bought a whole case of it. I only live up the road from where you work btw. fishon I think k100 is sold at advance auto if that helps. Poles like copo said it's the older engines (mines an 86) that really have issues, especially rubber and plastic lines, fiberglass tanks that were never designed to be around alcohol and want to get dissolved by it...plus the phase separation you have alcohol in the gas, and the alcohol is water loving and will suck water right out of the air over time, once you get enough water in the fuel it separates out and then the fun starts haha.