The week in petroleum analysis released March 20, 2013 by the EIA reported that the national average diesel fuel price decreased four cents to $4.05 per gallon, 10 cents lower than last year at this time. Prices decreased in all regions of the nation. The largest decrease was in the West Coast where the average price per gallon fell seven cents to $4.16. The Gulf Coast price decreased five cents from last week to $3.99 per gallon. Both the Rocky Mountain and East Coast prices fell four cents to $3.97 per gallon and $4.08 per gallon, respectively. The Midwest price decreased three cents to $4.02 per gallon.