sounds a fantastic idea (if it works), however if petrol was £2.50 a gallon i'd be driving a V12 Jag with a smile on my face, notice they have a regular car as a 3.0 litre!
I have tried quite a few of these kind of things as i run a fleet of vans (no not commers ) and i have never yet found any that actually work. I even designed my own hydrogen setup. They all sound great but the reallity is its 90%hype and the rest is BS! In saying that i have not tried this particular version. Anyone does find some real benifit i would like to know more...