They claim to get more power out, than they use, so, of course it's a scam - or a succsesful perpetual motion machine. They can't be electrolising the water, with such a small amount of electricity. I think what is happening is this : the water is evaporating because it's connected to intake manifold vacuum, which reduces the boiling point - water will evaporate rapidly under a vacuum.
It's like being at a very high altitude. The electricity used just heats the water slightly. Any observed increase in mileage is surely caused by the driver doing his best to improve mileage - so he drives with a very light foot, which can have a big effect.
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