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I thought I posted in this thread yesterday, but the intertubes must've ate it. Anyway, from what I've read, the addition of hydrogen into the mix 'effectively' increases the octane rating of the fuel. This means that you can run higher compression and leaner air/fuel mixture without detonating, resulting in more power . In the 70's when we were all running leaded fuel with 99.7 (RON) octane ratings, the compression was higher, the cars had more power, and fuel economy was only slightly worse than it is now.
I believe the technology does work, but that you'd need to do more work than bolt on a hydrogen generator to see any _significant_ gains.
I found some numbers of interest on the site of the _one_ canadian company selling these that has government verified numbers. 13 amp draw, 4 litres of water per 10,000km (~1 gallon / 6000 miles) and a verified improvement of 4%. The company guarantees you'll see 10% (on a tractor trailer I'm assuming).
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