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I just stumbled across this thread and wanted to jump in here and thank Road Warrior for his explanation (on page 1) of how it is possible to increase gas mileage using a HHO generator. It is the first time I have seen a logical explanation of how users seem to get something for nothing. It is the only logical answer - they don't. Please correct me if I'm misinterpreting what was said, but here's what I got out of it:
In order to generate the HHO, you need some extra power from the engine (to run the alternator). To get extra power from the engine, you step on the gas pedal a bit more which opens the throttle. Opening the throttle reduces pumping losses making the engine run more efficiently. So you use more gas, but not as much as you'd expect. You don't get the energy to make HHO for free, but for cheap. The HHO system makes fuel for the engine. There are energy losses in making the fuel (HHO), but these losses are more than offset by the increase in engine efficiency due to decreased pumping losses.
I didn't mean to make this a long post, but I just saw a potential problem with making this work in practice. My understanding is that the HHO is not stored but used as it is made. So let’s say you get onto the freeway and get to cruising speed. At first you will have to have your foot into it a bit more to run the alternator to make HHO. But as the HHO gets made and sent into the intake air stream the engine is getting extra fuel. So to keep your cruising speed you would need to back off of the throttle, thereby increasing pumping losses. Thus you are giving back some of the efficiency you gained.
Even so, I can see it being possible that there is still a net gain, especially considering the use of waste heat to facilitate the HHO generation process.
Just trying to get my head around this. Thanks to all the (constructive) posters for the help.
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Hybrid Mode
