The average U.S. price of regular-grade gasoline has dropped 8 cents per gallon over the past two weeks to $2.66. Industry analyst Trilby Lundberg of the Lundberg Survey said yesterday that an abundant supply and low crude oil costs helped the decrease at the pump. The price is currently 25 cents lower than what it was a year ago. The lowest price for a gallon of gas in San Luis Obispo was found at Costco for 3.25 a gallon. In Santa Maria #1 Car Wash & Gas, Costco, and Foods Co. had the lowest prices for a gallon of gas at 3.29 a gallon.