The national average price for diesel has fallen for the fourth straight week while gasoline is up for the ninth consecutive week, according to the U.S. Energy Department.

Diesel shed 1.6 cent from last week, registering $3.959 per gallon, its lowest price since early February. Over the past four weeks it is down 6.2 cents. Compared to the same time in 2013 it is 1.8 cent lower

Prices fell in all regions of the country, with the fuel ranging from a low of $3.793 in the Gulf Coast states, down 1.1 cent from a week ago, to a high of $4.24 in New England, 1.5 cent less during the same time.

In contrast, the average cost of gasoline gained 1.7 cents from last week, hitting $3.596. Over the past nine weeks it has gained 30.4 cents but is still 1.2 cents less than during the same time last year.

Gasoline ranges from a low of $3.392 in the Gulf Coast region, up 4.9 cents from a week ago, to a high of $3.88 in the West Coast region, up 2.8 cents during the same time.

As for oil it fell on Monday by 70 cents in New York trading, settling at $100.44 per barrel, but is up less than a dollar form a week ago. Some of the ground gained by crude happened last Friday, as prices increased on U.S. job gains and doubts Libyan oil exports would soon resume.