I've been using this for my Outdoor Power Equipment (OPE) for the past season. It provides fuel stability up to four months, prevents phase separation and cleans like crazy. Pulled the spark plug in my Stihl trimmer and the piston top is visually completely clean. My John Deere 265 ran noticeably smoother after a full tank of treated fuel. They package it in a quart bottle too and it's less expensive that way.
It might be overkill to use this in every tank with a motor vehicle, but it does work as advertised....