So Jim, your conclusion for best performance is to mix 93 and 110 octane instead of 93 + lead additive? That seems to make sense if you assume the 110 is all "gas" and the 93 is a mixture of gas, crap, and ethanol that contains less energy. You'd have the octane plus more energy. 110 here was about 6.50/gal last time I checked but it wouldn't end up being that much more than using the additives.