I wouldn't trust the octane boost, because it wont be consistant. I would just take like a two gallon container full of race fuel or AV 100LL and when you get to the gas station pour half of it in and fill the rest of the tank with 93. At the next station do the same thing, it wont be dead on but it will be close to 50/50 which should work out for ya. Unless you can figure out a more accurate way to measure the 50/50 part, but over on the higher octane wont hurt anything............