The U.S. average retail price of regular gasoline decreased seven cents to $3.56 per gallon as of August 12, 2013, 16 cents lower than last year at this time, according to the Aug. 14 issue of This Week in Petroleum, published by the Energy Information Administration (EIA). Prices decreased in all regions except the Rocky Mountains, where the price increased one cent to $3.64 per gallon. The largest decrease came in the Midwest, where the price fell 11 cents to $3.48 per gallon. The East and Gulf Coast prices both fell six cents, to $3.57 per gallon and $3.39 per gallon, respectively. Rounding out the regions, the West Coast price declined five cents to $3.84 per gallon.

The national average diesel fuel price decreased one cent to $3.90 per gallon, seven cents lower than last year at this time. Prices decreased in all regions, led by two-cent drops in the Midwest and the Gulf Coast, to $3.86 per gallon and $3.82 per gallon, respectively. On the East and West Coast the price is down one cent, to $3.91 per gallon and $4.05 per gallon, respectively. Rounding out the regions, the Rocky Mountain price declined less than one cent to remain $3.93 per gallon.

See charts here