Average gas prices across the country are a little lower than a week ago. Triple A says the average price nationwide for a gallon of regular is $2.31, down four cents from last week. Iowa drivers are paying $.08 below the national average at $2.23. The Davenport area continues to post the lowest average price in the state at $2.16. The highest gas prices are in the Waterloo-Cedar Falls area at $2.36 a gallon.