I was driving a Austin Healy around 1970 when Chevron introduced Techron into their gas(about $.25 a gallon). My sensitive side draft carbs were always black in the throat from the typical fuels then.
My first tank of Chevron with Techron cleaned the carbs to shinny aluminum. When I burn other brands of gas I will burn a tank or two of Chevron every oil change or put a bottle in the tank.
I stay with it because I know it works.