Triple A says the cost of a gallon of regular gas in Iowa is eight cents below the national average. The average price is $2.41 cents a gallon. The highest price at the pump is in Des Moines at $2.50 a gallon. For the second week in a row, drivers in Council Bluffs are paying the least per gallon at $2.30. The nationwide gas price is $2.49 a gallon.