You can find a video
here that runs through a little of the specifics of my HHO Generator.
I recently ran a few tests and had some amazing results. Only using the generator for 1/2 the tank I gained 8 MPG on the entire tank (if these results are consistent thats 16 MPG gain!) Unfortunately the amount of current I was running ruined my cheap plates.
I'm remaking my rig as we speak; it should be ready to go again in a week or so. Thanks for the interest, feel free to message me for more information!