My bike mixes oxygen in with the fuel then lights it off with a spark from the ignition.
Works pretty good.

 

Probably some nitrogen in there too.

 

NINE (9) year thread bump! I gotta say that has to be a record here on HDForums!

But since it is bumped . . . I fill my tank with the lowest grade 7/11 gas I can find. I then have a Wolverine pee into the tank as those bastards are full of **** and vinegar. Shake that up, and add two tablespoons of Franks Hot Sauce, as I put that stuff on and in everything!

In all seriousness . . . pour what you want into your tank. Unless you dyno with objective analysis and long term evaluation with a control unit under the same scenarios, of course it's going to make it better. It has to, to convince yourself the money was well spent.
I know for a fact the big red spark plug wires HD sells, add like 11hp and 13 ftlbs or torque to my bike.