This gizmo sounds like something J.C Whitney would sell.
They used to have a pill that you would drop in the cylinders, that
sealed your engine, give you more power, and increase fuel economy.
In a matter of fact, I think that their curb feeler's give you a fuel
mileage increase of at least 15%!
Snake oil, thats all!

Chow,Chow for now,

Terry

85 GL