One of the Burning Man organizers wrote me last week saying he wanted to participate in Boomershoot 2007. We got to chatting and he sent me at link to this video of the fireworks show they put on for Burning Man 2007. He also gave some technical details:

The fireball was about 600 feet high and probably 500 in diameter or more as it expanded. I think it had somewhere around 1200 gallons of fuel shot into the air from the four tanks. Then several thousand gallons of liquid propane were shot up the middle of the 99 foot tall derrick.

Boomershoot's biggest fireballs have used four gallons of gasoline. Of course most of our viewers were within 20 yards, but still...