WASHINGTON, D.C. --- The U.S. average retail price for regular gasoline rose 2.2 cents to $2.818 per gallon, as of Sept. 10. That's 20.0 cents higher than the average price during the same week last year, the U.S. Energy Department's Energy Information Administration (EIA) reported. Retail regular gasoline prices were up throughout all of the major regions during the week, with the Midwest moving up by 0.6 cent to reach $2.979 per gallon, the highest in the country and 53.1 cents per gallon over last year's price. East Coast prices grew by 2.1 cents to $2.730 per gallon. Prices for the Gulf Coast gained 3.6 cents, settling at $2.693 per gallon, the lowest regional price. The Rocky Mountain region price rose to $2.836 per gallon, up 1.5 cents during the week but 4.8 cents per gallon lower than this time last year. West Coast prices grew 4.4 cents to $2.816 per gallon. The average price for regular grade in California was up 4.8 cents to $2.839 per gallon, 11.0 cents per gallon lower than the previous year. Retail diesel prices climbed to $2.924 per gallon, 3.1 cents more than the previous week and 6.7 cents per gallon higher than the same week last year. Diesel prices rose in all regions of the country, the EIA said. The largest increase, 4.5 cents, occurred on the East Coast where prices settled at $2.912 per gallon. In the Midwest, diesel prices rose 3.2 cents to $2.942 per gallon, while the Gulf Coast diesel price increased 2.9 cents to $2.865 per gallon. The Rocky Mountain region's diesel price increased 1.6 cents to $2.955 per gallon. The West Coast price grew by 1.0 cent to $2.982 per gallon. California diesel prices went up a cent, settling at $2.995 per gallon, 13.0 cents per gallon lower than a year ago.