Opel/Ford/Mercedes
Military history book catalogs will have illustrated books about the WW-II German vehicles available.The books I have on Opel/Ford/Mercedes have very clear photographs of the wood-gas units.They may have technical info on construction/operation/efficiency,don't know at present as I was interested in other aspects of the vehicles.
I suspect Japan had similar tech,as they were doing technology transfer with the Third Reich and were also running out of petroleum,ending up digging pine roots for fuel.
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