Many oil refiners along the Gulf of Mexico prepared to reopen their plants after shutting ahead of Ike's approach, reducing the nation's refining capacity by almost a fifth.
Valero Energy Corp., the largest U.S. refiner, said it found ``no significant structural damage'' at three Houston-area refineries it had closed.
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The Department of Energy said it would release 939,000 barrels of crude oil from its strategic reserves to help offset the closures.
Gasoline futures dropped more than 5 percent on the New York Mercantile Exchange.