When you fill-up this morning, you may notice the price of gas has crept up a bit. Industry analyst Trilby Lundberg of the Lundberg Survey says The average U.S. price of regular-grade gasoline increased by 2 cents over the past two weeks, to $2.24 per gallon. California’s average price per gallon of gas is $3.12. Higher on the Central Coast. the average price of regular gasoline in San Luis Obispo County is $3.23. In Santa Barbara County the average price of regular gasoline is $3.13.