On Tue, 01 Apr 2008 01:25:08 GMT, Jeff <kidsdoc2000@hotmail.com>
wrote:

>I don't know how much hydrogen costs.

Well, a liquid gallon of hydrogen mixed with oxygen is about two
cents, but that's about 90% oxygen by weight, so say you need ten
gallons of the mixture, for about 20 cents. The separation is the
trick.

J.