Gas prices continue to go up across Northern Arizona. Triple-A Arizona says the average price of gas in the state is $2.38 a gallon, which is seven-cents higher than last week. In Flagstaff, the price at the pump is up a nickel on average from last week to $2.48 a gallon. Some stations are selling gas for $2.45 a gallon and lower. In Prescott, gas prices are up nearly nine-cents a gallon from last week to $2.40 a gallon. Some stations are selling gas for $2.21 a gallon and lower. Triple-A says a rise in oil prices and a rise in demand is leading the surge at the pumps.