The price of regular unleaded gasoline fell 5 cents, averaging $3.06 across Iowa, according to AAA. As of Wednesday, the price of regular unleaded gasoline averaged $3.06 across Iowa, according to AAA. Prices fell 5 cents from last week’s price and are down 88 cents from a year ago. The national average on Wednesday was $3.25, down 7 cents from last week’s price. Retail diesel prices in Iowa fell 5 cents this week, with a statewide average of $3.39. One year ago, diesel prices averaged $4.26 in Iowa. Tips for saving energy on the road or at home are available at energy.gov and fueleconomy.gov.