Stories from a South Dakota fuel retailer and a company that builds engines for NASCAR disprove the oil industry's allegations that E15 is bad for car engines and that there is no demand for it, writes Holly Jessen. Bruce Vollan said his annual sales volume has tripled since he invested in blender pumps, Jessen writes. Andy Randolph, the engine technical director of Richard Childress Racing, said that since NASCAR shifted to E15 more than two years ago, race cars have run millions of miles on the blend without any adverse effects, Jessen notes.

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