total BULLSHIT.
They are using ELECTRICITY to break the water down into Hydrogen to burn in the engine essentially.
NOT EFFICIENT AT ALL compared to using the electricity in a motor to push it. DIRTY too, pure water will NOT conduct, so won't break down without huge, like 1300 F temps to spontaneously dissociate the molecules under the right conditions. again NOT EFFICIENT!!
To fix this, they put an electrolyte into the water so it conducts. Typically a salt. Ok now you got salt water you are dissociating, well guess what, the salt breaks down too, So you get free chlorine, I want to say with your oxygen, and other chlorides, and hydroxides potentially as well. CORROSIVE!! POISONOUS !!
Even if they actually just put hydrogen in a storage tank and pumped it straight in (instead of petrol, wow sounds familiar), the energy to separate out and purify the hydrogen is more than they are getting out of it. JUST BURN THE FUEL you used to convert / clean the H2 and be more efficient.
BUT, I hear if you buy one now, they'll throw in a free perpetual motion machine at NO CHARGE!!! You can use the kinetic energy off of that to run a small generator to power your bike when backing up!
Aaron