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benemid 500 mg That regulation, which would reduce the amount of sulfur in U.S. gasoline by two-thirds and impose fleetwide pollution limits on new vehicles by 2017, was ready in December 2011, said three officials familiar with the proposal. But agency officials were told to wait a year to submit it for review because critics could use it to suggest that the administration was raising gas prices, they said. The EPA issued the proposed rule in March.