(Des Moines, Iowa) – Officials with AAA report (as of August 18th), the price of regular unleaded gasoline was down 5 cents per gallon over last week, averaging $3.22/gallon. That’s also down an average of 49-cents from a year ago. The national average for unleaded as of August 18th, was $3.41/gallon, down 4-cents from the week before.

Retail diesel prices in Iowa were three-cents lower, averaging $3.51/a gallon. One year ago, diesel was selling for $4.12/gallon in Iowa. The current Iowa diesel price is 23 cents lower than the national average of $3.74/gallon, according to the automobile club. By comparison, the national price of diesel last year on Aug. 18th, was $4.35/gallon.