Gas prices continue to tumble across Arizona. Triple-A Arizona says the average price of gas in the state is $4.17 a gallon, which is 19-cents lower than last week. Diesel fuel is also 19-cents lower than a week ago, sitting at $5.01 a gallon this week. Triple-A says even though demand is up and supply has tightened, the price of oil remains low, which has kept prices at the pump in a steady decline. As of Friday morning, oil prices were $92 a barrel. In Flagstaff, gas has fallen 13-cents since last week, to sit at $4.44 a gallon. Diesel has fallen 14-cents a gallon to $5.14. Some stations are selling regular gas at $4.29 a gallon and lower. In Prescott, gas has dropped 11-cents a gallon on average to $4.40 a gallon, while diesel is down 20-cents a gallon to $5.16.