The national average diesel fuel price dropped three cents this week to $3.89 per gallon according to the Gasoline and Diesel Fuel Update published by the EIA. Both the East Coast and Midwest prices declined by three cents from last week as well to $3.98 per gallon and $3.84 per gallon respectively. The average diesel fuel price in the Rocky Mountain region also fell three cents from last week, making the new average price $3.91 per gallon. Declining two cents from last week, the West Coast’s average diesel fuel price is now $3.99 per gallon. The Gulf Coast price only decreased by a penny, but at $3.77 per gallon is the lowest average diesel fuel price in the nation.