I have researched this subject but i'm still a bit skeptical. A lot of people swear it works, but is there proof? It just strikes me that having spent a lifetime trying different chemicals in every imaginable cleaning application imaginable that to remove carbon in a combustion chamber with a tiny bit of chemical mixed into the fuel just seems impossible. I can see using it in every tank as maintenance and i imagine that could help keep it clean. But once baked onto the surface that stuff is on there like rock. to think you could run 2 or 3 tanks of gas with a few oz of this stuff in it and remove the carbon seems fictional at best. I WANT to believe it, but i need proof. Has anyone really seen the results first hand, and if so how?