Tom Sixkiller wrote:

How much hyrogen is can be obtained from petroleum relative to the energy
required for fuel cells?

Auburn University has developed a method of separating the hydrogen from diesel
fuel. Preliminary results indicate that a truck using fuel cells fed by their
separator gets about 3 times as many miles per gallon as a conventional diesel
truck of the same size. I only saw the one AP article about it, however, and
who knows how accurate it is. One of the unanswered questions is what happens to
the carbon and sulphur which is separated out. The article also said that the
military is getting involved. That would slow down its availability in the
civilian market if the Army wants to keep a competitive advantage (which they
will).

George Patterson
Battle, n; A method of untying with the teeth a political knot that would
not yield to the tongue.