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http://auto.howstuffworks.com/how-a-hydrogen-boosted-gasoline-engine-works.htm

This article is about how a hydrogen boosted engine works! A hydrogen boosted engine can increase engine effeciency by 20-30% !! It works by injecting a small amount of hydrogen into the cylinder with the gasoline and air in order for the engine to pump less. Hydrogen boosted engines are a promising alternative to increase fuel effeciency!