Fuel for thought: cars that run on vegetable oil? Do-it-yourselfers and entrepreneurs alike fill 'er up with the nation's fastest-growing alternative propellant.(PHENOMENA & CURIOSITIES)

Publication: Smithsonian

Publication Date: 01-SEP-05

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Every few weeks, Etta Kantor goes to a Chinese restaurant and fills a couple of five-gallon pails with used cooking oil. Back in her garage, the 59-year-old philanthropist and grandmother strains it through a cloth filter and then pours it into a custom-made second fuel tank in her 2003 Volkswagen Jetta diesel station wagon. Once the car is warmed up, she flips a fuel toggle on the dashboard to switch to the vegetable oil. Wherever she drives, she's trailed by the appetizing odor of egg rolls.

Sean Parks of Davis, California, collects his cooking oil from a fish-and-chips restaurant and a corn-dog shop. He purifies it chemically in a 40-gallon reactor that he built himself for about $200. The processed oil can be used even when his car's engine is cold, at a cost of about 70 cents a gallon. Parks, 30, a geographer for the U.S. Forest Service, makes enough processed oil to fuel his family's two cars.

Kantor and Parks are willing to go the extra mile to reduce their dependence on petroleum and cut down on pollution. But these days environmentalists are not the only ones banking on biodiesel, as diesel-engine fuel...

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