Average US gas prices fall 7 cents thanks to crude costs Loop News Created : 8 October 2017 Energy The average price of a gallon of regular-grade gasoline fell 7 cents nationally over the past two weeks to $2.56. Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that the drop comes as crude oil prices drop and flooded refineries on the hurricane-battered Gulf Coast return to operation. Lundberg says she expects further price cuts as refiners make cheaper "winter grade" gasoline. The current price is 27 cents above where it was a year ago. Gas in San Francisco was the highest in the contiguous United States at an average of $3.11 a gallon. The lowest was in St. Louis at $2.20 a gallon. The U.S. average diesel price is $2.76, down a penny from two weeks ago.