I don't know about a lot of that stuff. I add little acetone and xylol (xylol is mainly just a filler) to my fuel that is about it.
H2O2, I don't think that is a good idea. I have played with 40% and greater H2O2, it is high energy stuff. Don't think I would want to put it in my gas tank.
Some thing that could readly break down into pure 02, I don't think so.
I know if I want gas milage, I have to get rid of my straight drive belt driven fan and swap it for a eletric one.
A CAI would help to, hot engine air is not good.