WASHINGTON, D.C. --- The U.S. average retail price for regular gasoline fell to its lowest price this year, with prices decreasing 1.8 cents to $2.20 per gallon as of Nov. 6. Prices were 17.6 cents per gallon lower than at this time last year, according to the Energy Department's Energy Information Administration (EIA). East Coast prices fell 1.5 cents to $2.17 per gallon. In the Midwest, prices fell 0.9 cent to $2.187 per gallon. Gulf Coast prices fell 2.2 cents to $2.08 per gallon. The Rocky Mountains saw the largest regional decrease, with prices slipping 3.6 cents to $2.274 per gallon. West Coast prices were down 3.3 cents per gallon to $2.381 per gallon, 24.2 cents lower than at this time last year. Retail diesel fuel prices were also down this week, with prices falling 1.1 cents to $2.506 per gallon, 19.2 cents less than at this time last year, reported the EIA. East Coast diesel prices fell 2.2 cents to $2.508 per gallon and Midwest prices fell 0.8 cent, to $2.493 per gallon. The Gulf Coast saw the average price drop by 1.3 cents to $2.449 per gallon. There was no change in the Rocky Mountains, with prices holding at $2.577 per gallon. The West Coast was the only region to see an increase, with prices rising 0.4 cent to $2.606 per gallon.