Free Republic

"The system has been used to power a Vespa scooter with distilled water. "

bit was a dead giveaway that the story is bogus.

The whole scheme depends on electrolytic dissociation of water to yield hydrogen and oxygen. The resistivity of distilled water is too high to support electrolysis. Tap water works much better -- and if you toss in a little table salt, electrolysis really "gets cracking". (Pun intended...)

As others have noted, you would also get corrosion in your engine from the high-temp steam. Not sure if any increased fuel economy would compensate for the engine work that would shortly be needed.

I have a friend who put an electrolytic cell in his Toyota. He claims that he gets double digit % increases in mileage but he’s basing that on a milage computer with sensors that had to be tinkered with to keep the car’s computer in line. I’ve asked him to do a real test with and without over a closed course and base the mileage on gallons of gas consumed and the odo reading. Hasn’t done it yet.

That might be part of the problem, but the bigger part of the problem is that it takes more energy to separate the hydrogen from the oxygen than can be recovered when it is burned.

The only way this works to to be satisifed with lowering the vehicles gas mileage.

The only way I see hydrogen or browns gas as being feasible is if you use unused powerplant output to create it ,, most powerplants have a huge abundance of electricity overnight. I kinda like the 6-cycle engine idea ,, I suppose it would work better with a diesel to really get the temperature up with the high compression.