(Radio Iowa) – The latest survey shows gas prices have fallen again. Triple-A says the average price of a gallon of unleaded gasoline dropped 12 cents to four dollars, 46 cents. That is down 30 cents a gallon from one month ago. The current Iowa average is 17 cents below the national average. It is still one dollar, 48 cents higher than one year ago.

Diesel prices dropped nine cents this week to five dollars, 27 cents. It’s still well above the three dollars, 11 cents a gallon for diesel one year ago.