CASO,

You beat me to the punch. During WW2 in Europe gas was in such short supply that citizens began running internal combustion engines on firewood. It is still done by some today, but it is more difficult to reprogram the computer.

http://energyfarms.wordpress.com/2009/04/20/biomass-instead-of-gas/


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures