[HoosierDaddy]

My memory was that CenPeCo did not use methanol in their fuel conditioners. Theirs contain algaecides and are considered lubricating FC's. I confirmed that by email today just in case my memory was bad or they had changed their chemistry. The response I got is that they use emulsifiers to move water through. I do not understand exactly what an emulsifier is except that it has the ability to attach to water and oil. Continued use of a lubricating FC seems to minimize rust and algae in long term storage.
Considering that a minimal increase in fuel economy generally pays for the cost of the FC and independent tests under controlled conditions have indicated fuel economy increases I have been consistent in adding the recommended amount to my diesel vehicles over the last 30 years and have never had a fuel quality related problem.
It is possible that I may not have had any problems w/o the FC but I took comfort in knowing that if I did get a bad tank of fuel the FC may have added some protection to the fuel system and kept me going as many of the miles have been in diesel powered pick-up trucks and a diesel Jeep in very cold Indiana, Ohio, and Michigan winters.
How ever if I would have got a "slug" of water in my tank and I knew it I would drain it off!!!