I was just recently told about a company in Vancouver making a cool product. They call it Aquygen, its just a hydrogen producing system that they've finally got tuned properly.
Thier big application is basically a replacement for an acetylene cutting torch, that is cool to the touch. There are videos on thier site showing its capabilities.
I've heard about this YEARS ago, a friend had a simplified version in his mazda pickup truck and said he was receiving an extra 20% fuel milage using it. It was just a few glass canisters, with an electric coil inside. Through electrolysis, it produced small amounts of hydrogen, which were directed into the intake of the engine for burning. The process wasnt very efficient at the time, but now this company says they've got it down pat.
They say any vehicle can be fitted easily, diesel or gas. The system apparently has shown at LEAST 50% gains in milage over convention.
Take a look at thier site if you are interested, there's lots of cool info, and videos there. I think if the price was right, I would try one of thier vehicle units for sure!
Hydrogen Fuel Additives
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