Tracy,
I bought the Fitch Pellets several years ago, after seeing an article about it, in two different magazines. I think there are links to some of these articles on the Fitch web site. They did what seemed to be some good tests, and were convinced it works as advertised.
I Put two pellets in the 04 Corolla tank, one in the 04 Harley Road king, and one each, in two of my 5 gal plastic gas cans. I didn't put one in the old Kawasaki generator, because I always run it dry on each use. I am still using gas from the 5 gallon can I filled up a year ago, 4/22/13, for my generator fuel testing. It does not smell stale to me. I plan to keep using them, I believe it works.
Joe Bryant