The Gasoline and Diesel Fuel Update released August 8, 2013 by the EIA reported that the national average diesel fuel price declined one cent from last week to $3.63 per gallon. The Rocky Mountain region was the only region where the average diesel fuel price increased. The Rocky Mountain price increased two cents to $3.93 per gallon. Both the East Coast and Midwest prices declined one cent to $3.92 per gallon on the East Coast and $3.88 per gallon in the Midwest. The average diesel fuel price on the Gulf Coast and West Coast remained unchanged from last week. The Gulf Coast price remained at $3.84 per gallon, and the West Coast at $4.05 per gallon.