A survey says the average price of a gallon of regular gasoline in the U.S. has fallen 4 cents over the last three weeks to $3.67.
Industry analyst Trilby Lundberg said Sunday that crude oil prices fell over news that Libyan output has risen and Iraq's production was not substantially harmed by recent violence.
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The survey taken Friday shows the average price for a gallon of midgrade gas was $3.86 and the average price for a gallon of premium was $4.01. Diesel averaged $3.94 a gallon.
Of cities surveyed in the continental U.S., Tulsa, Oklahoma, had the lowest average price at $3.35 a gallon. San Francisco had the highest average at $4.12 a gallon.
In California, the average price for regular gasoline was $4.07 a gallon.