Royal Dutch/Shell Group of Cos. reduced its 2003 earnings by $203 million Friday, in an annual report delayed by two months due to the scandal arising from the company’s downgrading of its oil and gas reserves.

Yet even as it sought to restore its battered reputation, Shell suffered another blow when a U.S. refinery said it had supplied Shell gas stations in parts of Louisiana and Florida with gasoline that contained potentially damaging amounts of sulfur.

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