Diesel prices rang in the New Year by continuing a 2015 trend: an eighth consecutive weekly decline.The average U.S. retail pump price for diesel was down 2.4 cents in the Jan 4 report by the Energy Information Administration (EIA), to $2.211 per gallon. The price is about $0.93 per gallon cheaper than this time last year.Prices were down in every region of the country except for the West Coast less California, where a gallon of diesel was up 1.1 cents to $2.303 (but that follows an 8.1 decline the week before). Otherwise, California registered 1.4 cent decline to $2.595, still the highest price in the contiguous 48 states.The Rocky Mountain region saw a 3.6 cent decline to $2.2191, while the Midwest price was down 3.3 cents to $2.13.New England reported a 2.1 cent drop to $2.344, while the price also fell 2.1 cents in the Central Atlantic to $2.391, and diesel fell 1.8 cents in Lower Atlantic region to $2.143.The Gulf Coast reported a 2.6 cent drop to $2.114, the lowest price for a gallon of diesel in the nation.Gasoline prices were down slightly – six-tenths of a penny to $2.028 per gallon, national average. That’s about 19 cents cheaper than a year ago. Every region reported small declines except the West Coast, where gasoline prices increased 3.3 cents, largely driven by California.