Nothing to elaborate. They work. Period.
I use Seafoam and/or Chevron Techron for the gas and Seafoam for the Intake Manifold. Everytime I do the IM (through the booster line), my throttle response improves slightly. It seems like it’s just a little bit easier for the engine.
I don’t notice anything when I put it in the gas, but that’s probably because I only 93. I probably don’t have a dirty fuel system.
I maintain my car meticulously.