Put some BioWillie in your tank.

Country singer Willie Nelson introduced California to "BioWillie," his brand of clean-burning fuel made from soybeans.

BioWillie went on sale Wednesday at an alternative fuel station in San Diego where the 72-year-old singer filled his tour bus from a pump emblazoned with a picture of himself strumming a guitar.

"It is the future," Nelson said. "Through biodiesel, we can reduce dependency on foreign oil and adopt an energy source that's clean renewable and helps family farmers find new uses for their products."

"Putting some Willie in your tank" is not longer a playful term for sex, although they both usually involve grease of some kind.

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