The U.S. average price for diesel fuel increased less than half a cent from a week ago to $2.84 per gallon, $1.14 per gallon less than the same time last year. Regional price movements were mixed. The Gulf Coast and Rocky Mountain prices fell one cent, to $2.76 per gallon and $2.78 per gallon, respectively. The East Coast price was down less than half a cent to $2.93 per gallon. The West Coast price increased by four cents to $2.92 per gallon, and the Midwest price rose less than half a cent to $2.77 per gallon.