The average U.S. price of regular-grade gasoline has dropped 6 cents per gallon (3.8 liters) over the past two weeks to $2.74. Industry analyst Trilby Lundberg of the Lundberg Survey says Sunday that increased refinery production and lower crude oil costs contributed to the decrease at the pump. The price is 18 cents lower than what it was a year ago. The highest average price in the nation is $3.63 a gallon in the San Francisco Bay Area. The lowest average is $2.16 in Baton Rouge, Louisiana. According to GasBuddy.com, the lowest reported gas in Martinsville is at the CITGO and the Liberty Street Market, both on Liberty Street in Martinsville at $2.25.