Biofuels Digest brings us the story of Wayne Keith and his wood-syngas conversion for pickups (I get the feeling he uses mostly pickups because you can use the truck bed as you “gas tank.”
I think this option has a lot going for it. The biggest barrier to cellulosic biofuels in my mind is the dispersed nature of the resource… it’s difficult to gather it op in one place to convert it efficiently into fuel. So if the conversion is done in the vehicle, the dispersed nature of (especially rural vehicles) is a much better match for the dispersed nature of the resource.
Gasification is not a good option for urban vehicles (since the resource is relatively scarce there, although much garbage works in these trucks), but it seems an elegant solution for utilizing the large volume of diverse biomass that would never be collected by commercial operations because it is both to dispersed and varied.