Average gas prices in iowa are $.03 per gallon lower than a week ago. Triple A says Iowans are paying $2.32 for a gallon of regular. The national average is $2.39. Davenport drivers are paying least per gallon at $2.23 for regular, followed by Des Moines where the price at the pump is $2.26 a gallon. Waterloo-Cedar Falls drivers lead the state with the highest average price per gallon at $2.34.