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We did some work on hydrogen supplementing gasoline combustion when I worked at the Jet Propulsion Laboratory back in the '70's. We produced hydrogen-rich gases by catalytically breaking down some of the gasoline, using waste heat from the engine exhaust.
The point was to be able to run much leaner than possible with gasoline alone. This reduced combustion temperatures, dramatically reducing NOx emissions, and improved engine efficiency.
--Joe
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