Gas prices across Arizona are down over a cent this week. Triple-A Arizona says the average price of gas at the state’s pumps is $2.30 a gallon. In Flagstaff, the average price of gas is unchanged from last week, staying at $2.37 a gallon. Some stations are selling gas for $2.29 and lower. In Prescott, gas is down two cents a gallon on average this week to $2.32 a gallon. Some stations are selling gas for $2.19 and lower. Officials say low gas demand is contributing to a decrease in the national average and lower than normal prices at the pump for this time of year.