Fuel injector cleaners in a can are just solvents, they clean out the varnish that builds up over time in the tank, fuel lines, rails & injectors; I prefer Chemtool, Seafoam & Techron, I add a can every six months or so to keep said varnish cleaned out. FYI - Techron is added to Chevrons gas already so if you fill up there don't even worry about it.
The gas treatments that aren't specifically for injector cleaning are just alcohol as stated previously & bond to the water in the tank so it can be burned; since gasoline floats on top of water & in tank fuel pumps take up fuel from the bottom of the tank....there shouldn't be enough water in the tank to worry about, so unless the vehicle begins to sputter & miss after a fill up I wouldn't use a "fuel treatment" because they will cause a lean burn situation.
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