>> http://www.cnn.com/2002/TECH/science/08/28/sugar.cars.reut/index.html

> I am still wondering where the energy will come from to heat the sugar?

From the article:
"Our goal in a perfect situation would be to achieve a process where
 25 percent of the hydrogen would be used to heat the solution with the
 remaining 75 percent free to be used as fuel," Dumesic said. "But we
 are a long way from that."

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