427 S/O,
My can says 2.5 points with 1oz to 1 gallon, and that is a "full point", not a 1/10. So 93 octane goes to 95.5. See
http://www.klotzlube.com/support/techsheets/KL-602.pdf
FYI I called the tech guys at Klotz, and they said they just finished a study with Ford Motor Co, and the results were even better than what the label says.
It does not use Toluene either, but it has a "special" smell.
I mix like 16oz to 12 gallons when I fill up. It makes a noticable differance from the "NOZ" brand octane boost I was using before. I plan on Dynoing the motor soon, as I think I can get a little more timing out of it!
I was told by a buddy to try this stuff, and it works better than I would have thought. I recommend Klotz Octane Booster.
Eric