Gas prices are up across the state, but down in Flagstaff. Triple-A Arizona says the average price of gas is up a half-cent to $2.18 a gallon. In Flagstaff, gas was down nearly three-cents to $2.39 on average. However, some stations are selling gas for $2.27 a gallon and lower. In the Prescott area, gas was up a penny to $2.21 a gallon. Officials say the slight increase may have been because of increased drilling and production in the U.S.