Last week diesel prices fell for the fourth straight week in a row, down 2.3 cents to a national average of $1.711 per gallon, according to the U.S. Department of Energy. Significant drops in the West largely drove the decline, although all regions posted falling prices.

California posted the largest decrease at seven cents to $2.051 per gallon. West Coast prices fell below the two-dollar mark for the first time in 10 weeks, falling 6.5 cents to $1.998. New England prices had the smallest decline, falling 0.6 cents to $1.81. The Lower Atlantic region posted the cheapest prices at $1.636.