I am not sure where ford390 got his information but he is right and wrong form what I have read. I am not an expert but I found the following while searching around on the net. Good luck!

This was very informative. Especially about the lower gain when using higher grade to begin with.

A lot of this isn't for you but scroll down to the additive section. Good stuff there.

Again, scroll down to the section on boosters. Interesting.

I found these just looking around on the net. Take them for what they are worth (might not be much). I don't think that Ford360's evaluation was 100% accurate. If you use the right stuff (seems to be NOS) and you use in on low octane gas (you will) then you should see some improvements.

Good luck.