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I believe the HHO is what you are talking about with the big rigs. It does work but you have to lean your mixture so it requires some simple modifications. You can see a increase in MPG but also you have to purchase KOH and distilled water for the best results so you are stil spending $$. I have...

The HHO injection only works if you use electronics to lean the mixture, but it should make it run cleaner as it acts as a catalyst.