Gas prices across Arizona continue to fall as demand remains low and the price of crude oil continues to be below $100 a barrel. Triple-A Arizona says the average price of regular gas in the state fell 19-cents a gallon last week to $4.36. Diesel gas fell 13-cents a gallon this week to $5.20 on average. Spokesman Aldo Vazquez says gas prices continue to fall due to lower demand, but demand could rise as prices continue to drop, which could level out prices at the pump down the road. In Flagstaff, the average price of gas fell 11-cents a gallon to $4.57 on average. Diesel gas is down 13-cents a gallon to $5.28 on average. Some stations are selling regular gas for $4.47 a gallon and lower. In Prescott, regular gas fell nearly 15-cents a gallon to $4.51 on average. Diesel gas fell 13-cents a gallon to $5.36 on average. Some stations are selling regular gas for $4.49 a gallon and lower.