Gas prices across the country are a little lower than a week ago. Triple-a says the price nationwide for a gallon of regular is $2.27, down four cents from last Friday. Iowa drivers are paying $.09 below the national average at $2.18, a nickel lower than last week. Sioux City checks-in with the lowest average gas prices in the state at $2.11, followed by Davenport and Des Moines at $2.13. The highest gas prices are in the Waterloo-Cedar Falls area at $2.27 for a gallon of regular.