Youtube's FortNine has made a nice video on the subject of fuel stabilizers:
i guess most of us use regular sta-bilRegular Sta-Bil for me.
Never had a problem, but I also use non-ethanol fuel most of the time. I've used some pretty old gas that has Sta-Bil in it and it worked just fine.
Not a fan of Seafoam for stabilizing or cleaning (I'm a Techron fan).