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 NAPA, Calif. (AP) - Call it the biofuel boomerang. Valentin and Nanette Humer sell their gourmet grapeseed oil to upscale Napa Valley restaurants. Then, they pick up the used oil to run their company cars.
The fry 'em up, fill 'er up approach saves restaurants money, greases the wheels of recycling efforts and makes the Humers' wallets a little fatter, too.
"We haven't seen a gas station in two years," Valentin Humer said with a laugh.
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