Gas prices have levelled out this week in Arizona. Triple-A Arizona says the price of regular gas is down a half cent this week to $3.99 a gallon, while diesel fuel is down two-cents a gallon on average to $4.98. In Flagstaff, gas prices continue to fall on average. Regular gas is down six-cents a gallon from last week to $4.14 a gallon. Diesel fuel is down two cents a gallon this week to $5.05 a gallon. In Prescott, the average price of gas is down eight-cents a gallon to $4.04, diesel is down five-cents a gallon to $5.05 this week. Triple-A says as long as oil prices remain low, the price of gas will continue to fall.