Diesel fuel prices are up across the nation according to the EIA’s weekly Gasoline and Diesel Fuel Update. The national average diesel fuel price is up two cents from last week to $3.97 per gallon. The West Coast had the biggest increase jumping five cents from last week to $4.03 per gallon. Both the Gulf Coast and Rocky Mountain regions had a three cent increase making the average price per gallon of diesel fuel $3.82 on the Gulf Coast and $3.97 in the Rocky Mountain region. Only increasing once cent from last week, the average diesel fuel price for the Midwest is $3.94 per gallon. Although the average diesel fuel price on the East Coast did not increase this week, the region continues to have the highest price in the nation at $4.07 per gallon.