Probing the Costs of Refining Oil

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High prices at the pump have consumers wondering how much the refining process adds to the cost of a gallon of gasoline. Refiners attribute the vast majority of their costs to meeting environmental regulations. Environmentalists say that's very misleading. NPR's John Burnett tours an oil refinery in Corpus Christi, Texas, to learn more about the process of "cracking" crude oil and separating it into gasoline and other distillates.

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