Marty Martin has no special plans for Earth Day. He'll drive his nearly 100-mile round trip from Keller to work in Plano, not particularly worried about conserving fuel in his aging Ford F250 pickup. But he's apt to draw reactions from other motorists as the slight aroma of french fries wafts from his truck's tailpipe. That's because his 9-year-old pickup runs on fuel made from used cooking oil in his garage at home.
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