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With all this crap coming down do your self a big favour and download the avaialble files from this website on how to build and use a wood gas generator. These generators were popular during WWII.
Even if your not technically savy enough to build a gas generator save the plans anyhow, there's a trove of information on the site below.
Build A Gasifier - Gasifier-Plans
Better just to buy a older diesel that you can run on WVO-WMO-WHO ect...I am working on building my 2006 Cummins to run on wvo but since its a CR I have to build whole 2ed fuel system and very few off the shelf parts can be used and so alot of modding/custom work has to be done but when its done it will drink its fuel from a 80gallon fuel tank along with the 30gallon. Also the system is being built so it can pump the WVO -> process it and put it into the 80gallon tank or into a storage tank so this way I don't even have to bring the WVO to a "shop" to turn it into a usable fuel....alot of things have to go into it make it work right on a CR diesel...best to buy a 2ed or first gen Cummins
Methane ... aka raw "natural gas" .
If you plan on building this, you may also want to build a "dryer" to increase the calories (combustibility) of your methane output.
The wood gas is a mixture of hydrogen and carbon monoxide. ( Both flammable gasses. )
I've seen it used to run small one or two cylinder carbureted motors at a constant RPM. Getting the flow rate of the fuel right is difficult because it's being used in the motor as it's being produced. (There's no fuel tank in the middle.)
Wood gas aka syngas technology has it's uses. It's really nice in the latest variety of wood stoves that are out on the market. You get a lot more heat out of a cord of wood with a catalytic converter after burner.
I know a variation on it was used on some 80's & 90's Ford engines. When the car/truck was running down the highway at an even speed the exhaust gas re-circulation valve would open up and dump exhaust gasses into the intake to be burned as fuel. As long as the motor was running steady without a heavy load it would run on a mix of carbon monoxide & hydrogen. When you tromped down on the gas pedal the EGR valve would close and the gasoline fuel would kick in. It helped boost the gas mileage of a vehicle and produced lower internal combustion temperatures which extended engine life. As far as i know they phased it out sometime in the early 2000's.
Most of the cars & trucks on the road these days are fuel injected with a computer brain adjusting things like timing & fuel flow at a rate of a thousand times a second. They're designed to burn the blended gasoline/ethanol fuels. They do a pretty good job at that one particular fuel but they're so complicated that it would be a job to run them on syngas.
It's like anything else .... good for some purposes .... not so good for other purposes.