The national average diesel fuel price decreased one cent from last week to $3.91 per gallon according to the weekly Gasoline and Diesel Fuel Update released by the EIA. At $4.07 per gallon the West Coast currently has the highest average diesel fuel price in the nation. The average diesel fuel price in both the East Coast and Rocky Mountain regions declined one cent from last week to $3.98 per gallon and $3.91 per gallon respectively. The Midwest region also decreased by one cent to $3.86 per gallon. The average diesel fuel price on the Gulf Coast declined by a penny, and at the current price of $3.80 per gallon is the lowest price in the nation.