Here:  http://en.wikipedia.org/wiki/Electrolysis_of_water#Efficiency

Stuart

P.S., I'm going to build one of these gizmos just for fun.  If it produces
enough hydrogen and oxygen to make a difference, it will probably blow up!

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike S
Sent: Monday, June 09, 2008 3:12 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Better MPG or snake oil - baking soda voodoo

At 03:24 PM 6/9/2008, Stuart MacMillan wrote...
>The law of
>electrolysis says it always takes more energy produce H2 and O2 than
>is
>produced by their combustion.

Which one, and where does it say that?
http://en.wikipedia.org/wiki/Faraday's_law_of_electrolysis

You have the right concept, but the devil is in the details.