The national average price for gasoline dropped about 3 cents over the last two weeks, according to a survey released Sunday.

The average price of regular gasoline on Friday was $2.97 a gallon, mid-grade was $3.09, and premium was $3.20, oil industry analyst Trilby Lundberg said.

Of cities surveyed, the nation’s lowest price was in Tulsa, Okla., where a gallon of regular cost $2.71, on average. The highest was in San Francisco at $3.35, according to the Lundberg Survey of 7,000 stations nationwide.

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Lundberg Survey: http://www.lundbergsurvey.com