The week in petroleum analysis released by the EIA May 15, 2013 reported that the national average diesel fuel price increased two cents to $3.87 per gallon, 14 cents lower than last year at this time. Prices in all regions of the nation increased, with the largest increase on the West Coast. The average price per gallon on the West Coast rose five cents to $3.97 per gallon. The Midwest price increased four cents to $3.91. The Rocky Mountain price is $3.97 per gallon, two cents higher than last week. Both the Gulf Coast and East Coast prices increased less then a penny to $3.87 on the East Coast and $3.74 on the Gulf Coast.