So what ya do is put about 6 litres in a plastic garbo, then sit the garbo in the middle of the campfire. Goes off with a big whoooosh 
Caution: move all the timber furniture and have a story ready on why all the leaves are burnt off the tree overhead (lowest leaves about 30ft)
That's nothing. Ask anyone from the motorcycling fraternity what a "Stones Bomb" (tm) is
You only need 250ml of "real" fuel (petrol or avgas) for a better effect
