The EIA reported that the national average diesel fuel price increased by three cents to $3.90 per gallon in the Gasoline & Diesel Fuel Update released July 22, 2013. The East Coast, Gulf Coast, Rocky Mountain and West Coast regions all had an average diesel fuel price increase of four cents per gallon. The West Coast came in the highest at $4.04 per gallon, followed by the East Coast where the average price per gallon of diesel fuel increased to $3.92. The Gulf Coast average price per gallon is now $3.84 per gallon, and the Rocky Mountain price is $3.87 per gallon. The Midwest had the smallest price increase of only two cents, making the new average price per gallon $3.87.