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U can find these on ebay, and other web sites, or u can build ur own - not to hard.

look here for starters - http://www.hhoforums.com/forumdisplay.php?f=14

What most people dont know is that the factory runs the ebgines a little rich - more than needed so the cats can burn the gasses better. And the engines can run alot better for fuel mileage and...

It could be that the HHO cleaned the O2 sensors, and part of the intake.
But useing very little gas - not possible. But if it cleaned the engine that can do alot by itself.

What size motor does...

Its hard to say cause its carburated, carbs work diff then FI.

We should start another thread for this, since ur asking questions, which is ok, but should be in another tread.

Start another...

If ur cell is only 200ml/min, i dont think thats enough. U need to ramp that up.

yes, means ur cell is getting too hot, and wasting power and efficiency.