1. Its cheap
2. made at home with minimal tools
3. endorsed by FEMA
aka ' The Wood Gasifier'!! as used by thousands during WW2 and other petrol shortages.
hell, in WW2 most of europe (cars/houses/industry) was burning this stuff!
found the link on 'Keelynet', man thats a good site!
just keep a drum of dry woodchips handy and your set

oh yeah, the guy described in keelynet runs his ford pickup on it, gets about 1 mile p/pound of wood, @ $3 for 40pounds.
all the best
Adam