Gas prices are down slightly across the state this week. Triple-A Arizona says the average price of gas is down about a half-cent on average from last week at $2.23 a gallon. In Flagstaff, the average price of gas is unchanged from last week, staying at $2.36 a gallon on average. Some stations are selling gas for $2.29 a gallon and lower. In Prescott, gas is down a half-cent to $2.26 a gallon on average. Some stations are selling gas for $2.09 a gallon and lower. Officials say demand is a little higher this week as people plan for Thanksgiving road trips, but overall gas prices have leveled off nationwide for the time being.