Gas prices in Arizona are starting to come back down after a spike last month. Triple-A Arizona says the average price of gas in the state is $3.10 a gallon on average, which is nearly two-and-a-half cents lower from last week. In Flagstaff, gas prices were up a cent from last week to $3.27 a gallon on average. A number of stations in Flagstaff are selling gas for $3.09 a gallon. In Prescott, gas prices were unchanged from last week, staying at $3.22 a gallon. A number of stations in Prescott are selling gas for $2.99 a gallon. Officials say the price of crude oil is driving prices down this week.