Hydrogen Fuel Saving kit

Hi I was wondering if anyone has installed a hydrogen fuel saving kit. I am looking to find out if they actually work and save gas. If you have any experience with this I appreciate your input.

Let's see, hydrogen in a gasoline compression motor.  Expansion rate how many times that of fossil fuel. Interesting idea, will the heads hold up to it?  Can you keep the pistons in their bore without pushing the crank out?