I get a bit annoyed at internet "experts" that test something in a way that has little to do with its actual use and then make pronouncements based on that. In this case, Stabil (and similar products) is a fuel stabilizer. The TEST of it is simple, can it "stabilize" or "preserve" (or whatever the proper term is) fuel so that it will still function properly after extended storage. With three vehicles sitting with fuel in the tanks for five years (none more than half full) and starting/running with no issue, clearly Stabil does what it is supposed to do - even better than Stabil claims (up to two years). As I have said before, I'm sure other similar products will do the same but Stabil is the only one I have used.