Not only is it "zero-sum" as you mentioned...it is actually a negative-sum RXN. i.e. it takes more energy to break water into hydrogen and oxygen than is gained from the combustion of the end product.

Also, take a look at the way they describe the workings of a CAT...pretty dodgy, and has a "scammy" flare to it. Sounds like something Kevin Trudeau came up with (my apologies to his fans on this list).

> Date: Wed, 13 Feb 2008 13:56:13 -0500
> From: mikes@FLATSURFACE.COM
> Subject: Re: Is this new gas saver for real?
> To: vanagon@GERRY.VANAGON.COM
> 
> At 09:59 AM 2/13/2008, Kenneth Wilford wrote...
> >sell two different devices.  One is the PICC and the other is a small
> >tank that cracks water into hydrogen and oxygen and mixes it with the
> >intake air.
> 
> Haw haw. It's a scam. It takes LOTS of energy to split water into
> "Brown's gas," which is why combining them back together provides lots
> of energy. But, the laws of thermodynamics still apply, it's a zero-sum
> game, and both processes are inefficient.

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