In this Thursday, May 1, 2008 file photo, high gas prices are posted at both a Valero gas station, which is a Exxon-branded gas station in California, and Shell gas stations in San Bruno, Calif. A reader-submitted question about gas stations charging fractions of a cent for their product is being answered as part of an Associated Press Q&A column called "Ask AP." (AP Photo/Paul Sakuma)

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