After nine weeks of falling gas prices, the average U.S. price of a gallon of gasoline is up 3 cents over the past two weeks. The Lundberg Survey of fuel prices released Sunday says the price of a gallon of regular is $3.25. Midgrade costs an average of $3.44 a gallon, and premium is $3.59. Industry analyst Trilby Lundberg said it’s the first price hike since September 6th.