The average price for a gallon of gas in Iowa continues to surpass the national average. Triple-A says the price in iowa this week is $2.32. The nationwide average is $2.28. Only South Dakota and Nebraska have higher prices among iowa's six neighboring states. The Davenport metro area posts iowa's cheapest gas $2.22 a gallon. Drivers in Des Moines continue to pay the highest prices at the pump at $2.48 for a gallon of regular.