gas additives

["Stephen Ristroph" <ristroph@csra1.csra.net>]

Has anyone on the list used gas additives to clean out the fuel
system of a Triumph.  I am talking about the name brand stuff like STP
or others.  Do these products effect SU carbs and other fuel system
hardware (in abad way)?  I am running 89 octane gas in my car and runs fine.  I 
just thought that 
using an additive to clean out the system might help the car.  Thanks

Stephen Ristroph
1972 Triumph Spitfire IV