CAMARILLO, Calif. — The average U.S. price of regular-grade gasoline dropped 2 cents during the past two weeks, to $3.23 per gallon.

Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that it’s the first decline in gas prices in nine months.

Nationwide, the highest average price for regular-grade gas is in the San Francisco Bay Area, at $4.49 per gallon. The lowest average is in Baton Rouge, La., at $2.70 per gallon.

According to the survey taken Friday, the average price of diesel was $3.33 a gallon, down just a fraction of a cent from weeks earlier.