Average gas prices in Iowa are $.04 higher than the statewide price a week ago. Triple A says Iowans are paying $2.36 for a gallon of regular. The national average is $2.40. Davenport drivers are enjoying the cheapest price at the pump at $2.25 for regular, followed by Sioux City at $2.35. Des Moines continues to post the highest price for regular gas in the state at $2.42.