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This could be another example of "faith-based" technology....that is, the more you believe it, the better it works.

The basic theory is pretty good but filtered down from big bucks generators to the stuff you see on eBay is questionable. "Mythbusters" did a piece on these HHOs and it didn't work, and the EPA tests just about every gas saving device known to mankind such as acetone, etc. and none of them have produced very convincing results, although a few have worked up to 5 or 6% improvement.

My feeling is that in the amounts of hydrogen generated by these little devices, it's not going to be enough to matter or to justify the expense. I may change my mind but that's what seems to be happening at the moment. The same is true for acetone. Believers get great fuel mileage, and skeptics using the same formula get nothing.

Go figure.

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In addition to Shifty's excellent points, the claims made by the hho bunch are particularly laughable - triple the mileage, that kind of thing. Pure nonsense.

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I can answer you question as far as my experience. Last week My Dad and myself put together a Hydrogen enerator-- It was crude at best but with a 1997 Ford Explorer - avg. MPG before was about 17 to 20 MPG.
We set it up according to the instructions and Pictures from Water4gas.com <--- I think. Anyway we also incorporated a small bubbler valve as a carrier (in the same Jar as coil) we expected to get some improvement.
After spotting SUV at a Gas pump marking tires and topping off to the very, very top of neck the tank we drove 20miles turned around and drove back to same pump (spotting tires on same mark),topping off tank to very very top until it was visable in neck and no bubbles. we used .987 gallons. Less than a gallon. This was our first try but It looks promising.
I never have seen the myth buster episode on this but would like to see their test and devise.

Source: http://www.usafastway.com/WATER4GAS/?m=2...

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Mr shiftrigrt 's comment said amound generated would not justify the cost -- the whole devise cost us less than twenty dollars -- we did not order it from anyone -- we just looked at the design of it and buildt it from things on-hand. we may have spent a total of $15.00. For the vacume line and fittings and stainless teel rod (for coil).

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If something that costs that little could double mileage, as you are claiming, the manufacturers would be doing it. That simple.

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I have been running an HHO generator in my 2003 ford ranger 2.3 liter for over a month. I draw between 2 and 4 amps and have seen an 11% inprovement in gas milage. Now, I am running a test at twice the current, but will have to wait to fill up to obtain results.

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