The U.S. average retail price of regular gasoline marked its largest weekly increase of 2011, advancing a nickel to $3.19 per gallon, $0.53 per gallon higher than last year at this time. Prices on the West Coast gained a dime, the biggest increase in the country. Gasoline on the West Coast is also the most expensive in the country at $3.48 per gallon. Prices in the Rocky Mountains were up about six cents, followed by the Midwest where regular gasoline gained a full nickel. On the East Coast, gasoline prices climbed more than three cents over last week, while prices on the Gulf Coast registered just under a three-cent gain to remain the lowest in the country at $3.03 per gallon.

Diesel prices rose for the twelfth consecutive week with the U.S. average retail price adding four cents to last week's price. At $3.57 per gallon, diesel is $0.74 per gallon higher than last year at this time. Diesel was up across the country, with the biggest increases coming on the West Coast and in the Rocky Mountains; in both regions prices were almost six cents higher versus last week. The diesel price in the Midwest registered close to a four-cent gain. Rounding out the regions, the East Coast and Gulf Coast both saw diesel averages increase more than three cents on the week.