We've had our share of posts on on-board hydrogen-generating engines over the past few years, and I'm sure there will be many more. The truth is that water engine hype will always need to confront reality from time to time. When it does, the results are not pretty. Coast To Coast AM wasn't fooled, neither was Popular Mechanics. We weren't either. But, because this particular hydra has a lot (a lot) of heads, Popular Mechanics has partnered with Dateline NBC and an EPA-certified lab to bust the myth once again that burning the hydrogen in water in your engine will triple your MPG.

The details are over on Popular Mechanics, and you should head over there to read the whole thing, but the short version is that PM senior automotive editor Mike Allen has done his homework, and none of the HHO systems work as advertised. None. We'll crib just one piece of math from Allen's article: onboard hydrogen systems change much less than one percent of the air needed in the combustion process to hydrogen. And that means that it doesn't boost your MPG by 300 percent. PM and NBC spent over $1,800 to prove that HHO systems don't work. You can just read the article.

[Source: Popular Mechanics]
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