My friend and I built an S10 for a demo that would run on woodgas. It's simply exploitation of a charcoal manufacturing process except the spent volatiles are the valuable asset not the char. The germans were all over this technology, but alas it died for a few decades. You have to filter the [censored] out of that gas stream via a water bubbler and a cyclone or else your motor will get filled up with abrasive particulates. I wouldn't try this with an OBDII car!
This might work for someone who normally heats with wood, but buys power from the grid. Feed a mix of producer gas and air into a diesel generator with the diesel injector amount set on idle, and let it run full tilt into a battery bank of your electric car. Collect the heat for hot water, space heating, or air conditioning via absorption chiller. During summer, spray the exhaust at ground level near a cornfield.
The British also used a lot of producer gas (blaugas) vehicles in both world wars, as did the Northern European countries. Great stuff.
Did anyone see the guy (I think he was in Germany) who composted woodchips and pumped the gas into innertubes, strapped the innertubes to his little pickup for his weekly trip to town?