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Easy to figure it out if you know the octane of what you are adding.

Let's say Toluene @ 114 oct. mixing in a 15 gal tank with 93 oct. by adding 1 gal of Toluene:

(93oct x 14gal) + (114oct x 1gal) / 15 gal

So - you'd get 94.4 oct.

You CAN buy Xylene / Toluene in bulk from chemical suppliers. They ARE the main agents in octane boosters. But, as someone said, you should be adding lubricating oil for the added wash-down effect.

I've looked into this (buying bulk chemicals). I found that after you buy all the crap, do the mixing, it would be easier to just buy race fuel and mix if need be.

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Yep. And those calculations show why that little can of 104 Octane Booster the autoparts store sells does not make your tank of gas 104 octane.