I remember seeing a article about a $600 Hydrogen generator the size of a large thermos bottle that fit under the hood and injected Hydrogen gas into the intake manifold boosting the fuel economy of the existing engine's fuel wither gas or Diesel, so this was a hybred not a 100% hydrogen fueld vehicle, they claimed reports of 4-11 mpg increase in fuel economy on mainly highway use vehicles. passenger vehicles and commercial trucks were featured.
The use of wood or charcoal as a internal combustion engine fuel source is well documented.
This fuel source has been round quite awhile, it faded out due to the fact that it isant near as effeciant, safe, easy maintenance as a gasoline or diesel powerd engine's.
during the OPEC oil crisses of the 1970's FEMA performed feasability study's on converting std gasoline farming tractors of the time to sucessfully use woodgas or syngas some modern cars and trucks have been known to be powerd by the gasification process, asian taxi's fuel'd by charcoal were used as late as the mid 1970's, a university in southern Florida even modified a enduro size motorcycle to run off woodgasification.
A few articals on woodgasification have been featured in FARMSHOW publication, one that featured a 80yro Canadian farmer/ ex-solder that recalled post WWII Allied war relief in europe who built his own from recollection takeing over 3 years to perfect it enough to run.
In occupied Denmark during WWII, 95% of all mobile farm equipment, tractors, trucks, stationary engines,fishing & ferry boats were powerd by woodgas generators, in neutral Sweden 40% of all motor traffic was operated useing wood or charcoal gasification.
WIKIPEDIA has a good summary of it, GOOGLE is a great source as well.
High efficency wood stoves use a catalitic converter that reburns the wood smoke extracting more of the volitile gasses generated when wood is burned.
A barrel stove is horribly inefficent when you consider all the wasted woodgas that is vented off up the stove pipe.
