This is one of many designs out there today for a home made Hydrogen on Demand conversion kit for any vehicle. Regardless of age, make, model, fuel type ect, this little device works off the access power provided by the vehicle to produce hydroxy gas, also known as Brown's gas for one of the original inventors of this technology. The hydrogen/oxygen gas ( no, not steam ) is added to the air/fuel manifold were the H-HO mixes with the most commonly found octane of gasoline which looks a little like this...
H H H H H H H H
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H-C-C-C-C-C-C-C-C-H
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H H H H H H H H
Even if you are not savy with basic chemistry, you probably know enough to realize that adding MORE hydrogen and oxygen (what gets pulled into your air intake) you will get both a stronger and CLEANER MORE COMPLETE release of energy, or burn as it is called. So, in basics you get a stronger explosion = more power, a cleaner burn = less emission, and both of those add up to MASSIVE gains in fuel economy. Average MPGs increase from 25% to upwards 110% depending on what kind of equipment you can afford.