Gas prices are remaining steady across Arizona. Triple-A Arizona says prices at the pump remain unchanged for a second week, sitting at $2.89 a gallon on average. In Flagstaff, prices are down nearly two-cents this week to $2.91 a gallon. However, some stations in the city are selling gas for $2.69 a gallon. In Prescott, gas is down nearly a cent to $3.00 a gallon. Some stations are selling gas for $2.89 and lower. Officials a combination of demand dropping, coupled with a change to winter blend gasoline and refinery maintenance, historically means a drop at the pump in September.