The EIA reported the national average diesel fuel price declines one cent to $3.90 per gallon in the Gasoline & Diesel Fuel Update released August 21, 2013. Both the Midwest and Gulf Coast prices went down two cents to $3.86 per gallon in the Midwest, and $3.82 per gallon on the Gulf Coast. Down one penny from last week the East Coast’s average price per gallon of diesel fuel is $3.91, and the West Coast is at $4.04 per gallon. The Rocky Mountain’s average price per gallon of diesel fuel remained at $3.93, no change from last week.