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Its not a steam engine. Its a technology that was in use in Europe during WWII when gasoline was in short supply for non-military users. They burn wood or coal under anaerobic conditions to produce carbon monoxide, then use the carbon monoxide to run the engine. The drawbacks of this system are that the added components are very bulky, taking up a lot of space in the vehicle, and produces a limited amount of CO, so the engine mostly runs at reduced power settings. The advantage is that you can still drive when gasoline is unavailable.
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