Well please post back. I heard myth buster did a bit on it and said, BUSTED, but they're not always right. I've seen some reviews saying Carb style engines are better for it.... The idea is to use electrolysis to break apart water... and the H goes back to a gas, Hydrogen, and the engine sucks it up. so you're running a mix of Hydrogen, hydro carbon vapor and Oxygen. PS, it's also called "BROWNS GAS". and you'll find opinions on both sides of the aisle. I'm keeping an open but no market bs approach to it. If they have cars running on Full Hydrogen, obvioiusly the gas is potent enough to power a car so the idea is not far fetched.
I think one problem is the GOV could never actually tax the fuel..... WATER!!!!! LOL. This issue alone would open a can of worms. but the HONDA FX? runs on commercially avail compressed Hydrogen gas from a fill station. Like filling up your Gas grille tank to cook. So they can easily track/Tax that.
If I had the money & time I'd buy one of these kits and put it on a lawn mower first. see how that does.