I don't know what claims the Lucas product makes, nor how true they are, but I can personally vouch for Stabil 360. I was having constant fuel contamination issues if my car sat in the garage for more than a couple of days. I would get this rust red gunk build up in my fuel filter to the point that it would restrict fuel flow. It apparently was very fine rust that was coming from the top of my tank not covered by fuel (the ethanol in gasoline absorbs water, which condenses out on the tank). Stabil 360's claim-to-fame is that it creates a protective vapor which prevents the rust that forms from the condensation on the tank.
I started using the additive and haven't had any more problems....fuel filter is absolutely clean after several thousand miles. Coincidence? Maybe, but I tend to believe it works and it is cheap insurance.