first off it's race fuel, gas is what you put in your every day driver.
there's a place on 66th that sells it, right by sherman williams, can't remember the name of the place for the life of me though. THey have 104. Also, why the need for the extra octane? If you haven't bumped compression or aren't running some sort of power adder it'll just slow you down..(unless you adjust your timing to compensate)..