All "top tier" gasoline should have sufficient additives blended in at the refinery to render products like Lucas Fuel Treatment and Chevron Techron unnecessary in modern vehicles.
That being said, I have found both products to be useful in older vehicles and vehicles that sit idle for long periods of time. I have "restored" more than one sticky injector by soaking it in a bowl of Berryman's Chemtool B-12, and I once had an old aircooled VW Type 3 with factory Bosch fuel injection that would run noticeably better with an additive about every fifth of sixth tank of fuel - Techron worked best, then Berryman's, then Lucas. (I might not have needed the additive if I had purchased new injectors, but I was on a tight budget with that car and was using the original 38-year-old injectors.)
I do not use fuel additives in my LJ unless I have to buy more than one tank of "no name" fuel from a low volume station in a remote area and question the quality of the fuel I am buying or if I suspect that I purchased "bad gas." Maybe it helps in those situations and maybe it doesn't, but I feel better about it.
I will be carrying a few bottles of Techron fuel treatment and some yellow Heet on an upcoming 2,200 mile trip in Baja California. I will never completely trust the quality of Pemex gasoline, hence the Techron, and yellow Heet contains methanol which is an old timer's workaround for gasoline contaminated with water because alcohol holds water molecules in suspension.