Gas prices in Flagstaff and Prescott are down this week.  According to AAA Arizona, the average price of unleaded gas in the state is $3.51 a gallon, which is down two-cents from last week.  Flagstaff’s price of unleaded is $3.77 a gallon on average, which is about a cent lower from last week.  Prescott has an average gas price of $3.56 a gallon, which is over three-cents lower a gallon from last week.