WASHINGTON, D.C. --- The U.S. average retail price for regular gasoline for Jan. 8 fell 2.8 cents to $2.306 per gallon. Prices are now 2.1 cents per gallon lower than at this time last year, reported the Energy Department's Energy Information Administration (EIA). East Coast gasoline prices fell 2.6 cents to $2.319 per gallon. The Midwest saw the largest regional decrease, with prices falling 5.3 cents to $2.21 per gallon. Gulf Coast prices dipped 2.9 cents to $2.171 per gallon. Rocky Mountain prices fell 1.2 cents to $2.234 per gallon. The only region to see an increase was the West Coast, with prices going up 1.3 cents to $2.594 per gallon. Prices there have now risen for nine consecutive weeks and are 29 cents per gallon higher than at this time last year. Retail diesel fuel prices also fell this week, decreasing 4.3 cents to $2.537 per gallon. However, diesel prices are still 5.2 cents higher than at this time last year. For the second consecutive week, all regions saw a decrease in the price of diesel. East Coast prices fell 4.5 cents to $2.52 cents per gallon, while the Midwest price dropped 5.1 cents to $2.483 per gallon. The Gulf Coast saw a decrease of 4.1 cents to $2.459 per gallon. Rocky Mountain diesel prices fell 1.5 cents to $2.682 per gallon, and prices on the West Coast decreased 2.9 cents to $2.824 per gallon.