Torco and Bootane are essentially the same, and are the only additives I know of that are formulated the way they are. They are more than octane boosters. They are a fuel conditioner as well.

I've looked into Race Gas a couple of years ago, but it wasn't made the same way as the other two so I just blew it off.

Somewhere in the web, there is a test of Boostane against pump gas, race gas, methanol/water injection IIRC. The additive did better than hold its own.

Torco was the company that started blending their additive the way that they do it. Of course, Evan Knoll was just a figure head. The real engineering was done by other people.