[cobrashoch]

A snake - Turbo Blue contains alcohol and that is primarly where its octane boost comes from. I MUCH prefer racing gas or plain unleaded 97 to 103 octane gas that does not have alcohol in it. You don't have to use as much as turbo blue to be as effective. Also there is nothing in it (alcohol) that buffers your fuel to the point were adding more makes it useless.
The toluene post by justa6 is a very good post and his results are valid. Another thing you can do is look for gas stations that sell 93/94 octane gas that does not have alcohol in it. There IS a difference between premium fuels out there.
Ernie - Retarding ignition is a mainstay when supercharging. It took me a while back in the late 70's to figure that one out. cobrashock