Or wood gas. At the end of WW2 there were about 500,000 vehicles with wood gas generators in use in Germany to make up for the lack of other fuels.[1] But under

Or wood gas. At the end of WW2 there were about 500,000 vehicles with wood gas generators in use in Germany to make up for the lack of other fuels.[1] But under today's conditions, this possibility does not seem to make economic sense. [1] See: https://en.wikipedia.org/wiki/Wood_gas https://en.wikipedia.org/wiki/Wood_gas