6. Wood Gasifier Cars (Wood Gas)
Wood gasifier cars emerged out of necessity during World War II, when gasoline was in short supply across Europe.
These inventive vehicles featured an onboard gasifier that transformed wood into a flammable gas to power the engine.
Although slower and bulkier than conventional cars, they provided a crucial transportation solution during challenging times.
Thousands of cars, trucks, and even buses were adapted in this way.
Read more about wood gas cars.