I forget what my formula is,would have to look it up,but I use lacquer thinner mixed with 93 octane for racing only,street use I just use the 93 octane..... I like a little more "protection" for my motor when racing..... Sustained high rpms and a little higher
oil and water temps......If I remember right I use "about" 15% to 20% thinner and end up with around 96 to 98 octane........
The lacquer thinner I use is 97% toulene and I get if from a local body repair shop,he buys it by the 55 gal. drum and sells it to me at his cost,last five gallons was a whopping 2 bucks a gallon..... A five gallon can usually last me a racing season.......pretty cheap "race gas"......been doing this for about six or seven years with the same gas tank,fuel pump,fuel lines and carb and have had NO problems,yet,knock on wood....
When I come home form a race or open track event,I usually try to use my car that week to go to work and use up any left over "race gas",just for safety's sake,I run the tank as low as I dare before filling up with 93 pump gas..........
David