Yes, it needs electricity from the battery to run the water electrolysis and it consumes fuel to charge the battery. But adding HHO to the engine makes the fuel (whether diesel or gasoline) burns so efficient that it saves more fuel than it uses to power the water electrolysis process.
For example, if 5% more fuel is needed to produce HHO and HHO gives you 25% fuel saving, then the net saving will be 20%.
Hydrogen Technology Applications Inc did three comparison tests just to show this. (1) driving 100 miles with their HHOS hydrogen generator ON they got 40.56 MPG; (2) driving the same distance with the generator OFF they got 33.0 MPG and lastly (3) driving the same distance with the generator ON but but released the gas produced into open air, they got 29.3 MPG.
So in their tests, injecting oxyhydrogen into the engine they got a net saving of 22%. Using the car battery to produce oxyhydrogen but not using it needed 11% more fuel. So the overall saving caused by injecting oxyhydrogen alone is 33% (11% lost in producing the gas). Note that their hydrogen generator’s current is 165 amps which are very high compared to others which are in the range of 10 to 25 amps. That was why 11% more fuel was used to power the HHO production. For the full tests, please right-click and save this PDF file: http://hytechapps.com/aquygen/hhos_test_20031021.pdf
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