Last week, the Obama Administration said its new calculations showed that grain-based biofuels like corn ethanol and soy-based biodiesel displaced more carbon dioxide than originally thought.

FORBES: U.S., Europe Going Opposite Way On Biofuels

That F350, running on 5% soy-based biodiesel (any more would void the vehicle's warranty), burns 840 gallons of fossil fuel a year doing 15, 000 miles, not including the petroleum used up to make the soy diesel.

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Currently biodiesel is made by refining vegetable oils like soy and rapeseed.

FORBES: Magazine Article