I have run Power Service for 131,000 + turns. Still have my orginal VP. I still have my lift pump also, although I did replace it with a FASS at 70,000, it still is ok. Good aditives will keep your tank free of moisture and bacteria. Power Service is what is most available to me. I know there are those that run Stan-a-dyne and other stuff and have very good results. I run a 32 oz bottle every tank when I am traveling cross country on my trips to Idaho or Utah, which is about every 3 months. Around town when I am home, I don't worry about it too much. I use 8 oz of Power Service Bio-Cide twice a year regular as clock work. I have never had water or moisture or anything else show up in my fuel when I do my filter changes.