The national average diesel fuel price remained unchanged from last week at $3.97 per gallon according to the Gasoline and Diesel Fuel Update released by the EIA. The only region that had a price decrease from last week was the East Coast, declining one cent to $4.06 per gallon. The East Coast price still remains the highest in the nation, however with its latest two-cent price increase the West Coast comes in a close second at $4.05 per gallon. Increasing one cent from last week the average diesel fuel price for the Rocky Mountain region is now $3.98 per gallon. The average diesel fuel price in both the Midwest and Gulf Coast regions increased less than a penny and remain at $3.95 per gallon and $3.82 per gallon, respectively.