The national average retail price of a gallon of diesel dropped 3 cents, to $2.189, for the week ending May 16.
The previous week, ending May 9, likewise saw a 3-cent price drop.
For the week ending May 16, the average price was down in every region tracked by the U.S. Department of Energy, the biggest drop being 8 cents on the West Coast.
On average, diesel was most expensive on the West Coast at $2.397 a gallon and least expensive in the Midwest at $2.129.
For state-by-state diesel prices, updated daily, visit http://www.etrucker.com/apps/promiles/fuelprices.asp.
