The national average price for a gallon of regular-grade gas on Sunday is $3.189, a week ago the price was $3.147, according to AAA. Statewide, the average gallon of gas cost around $4.610 Sunday, a week ago the price was $4.568. Prices in the area ranged from $4.19 a gallon in Redwood Valley, to $4.65 to $4.67 a gallon in Ukiah.