According to the Iowa Department of Transportation and AAA-Iowa, fuel prices in the state crept higher over the past week. As of Wednesday, Jan. 18, the price for a gallon of regular unleaded gasoline averaged $3.22, a seven-cent increase from last week and 10 cents higher than one year ago. The national average on Wednesday stood at $3.36 per gallon, a nine-cent jump over the past seven days. Movement in Iowa retail diesel prices was muted with a one-cent increase to $4.21 per gallon. This price remains 80 cents over last year but still 40 cents below the national average. Wholesale ethanol was unchanged from $2.16 per gallon. In heating fuels, propane prices were up one cent to $1.94 per gallon, home heating oil prices rose 10 cents to $3.60 per gallon, and natural gas costs were up nine cents at the Henry Hub reporting site to $3.37 per MMBtu.