EXE... it doesnt work-in general. it takes more power to convert the water into HHO then you get back by burning the HHO after the conversion process. ive messed with it and the only times it gives a positive feed back is when you are not draining conversion power from the same source that is providing power to the tires.
in the first test we ran-the only time we got positive resultes was when the acceleration was followed by a long term decell process----generally in town driving... but the results were pretty much inconclusive.
we then put in a seperate battery that powers the HHO generator in a sort of standalone system, a relay that diverts alternator power to the generator only when decelerating(nitrous switch at the rest position of the throttle pedal)-thus using the free RPM's of the engine to recharge the standalone system.
results are getting better but the battery still has to be charged at home every night cause the decel charging just isnt enough.
next we are putting a solar array ontop of the tool box in the bed....thinking this will help.
the problem is that a generator that makes enough gas to even make a difference in a big diesel (cummins, ps or dm) pulls a LOT of amps.
the only way to get a positive MPG change is to make sure those amps come from a free source.
its fun to mess with but the crap you see on youtube and the rest of the enternet is a SCAM
hope this helps