The national average diesel fuel price decreased by one cent from last week to an average of $3.99 per gallon according to the Gasoline and Diesel Fuel Update released by the EIA. The East Coast’s average diesel fuel price decrease by two cents from last week, but still remains the highest average price in the nation at $4.12 per gallon. The Midwest also had a two-cent price decrease making the average diesel fuel price $3.97 per gallon. Both the Rocky Mountain and West Coast prices declined by a penny to $3.98 per gallon and $4.01 per gallon respectively. Unchanged from last week, the average diesel fuel price on the Gulf Coast remains at $3.80 per gallon.