The national average price of retail diesel fuel dipped 1 cent to $3.843 a gallon, the Department of Energy reported Aug. 11.
Gasoline also fell a penny, to $3.505 a gallon, DOE said following its weekly survey of filling stations.
The sixth straight diesel decline left trucking’s main fuel 5.3 cents below the corresponding week last year. Gas is 5.6 cents less than a year ago.
Diesel, which has fallen 7.7 cents in the past month and a half, is down 17.8 cents since topping out at $4.021 in early March, its highest level in almost a year.
Gas also has declined for six straight weeks, falling almost 20 cents in that period.
The downturns followed low oil prices last week, with crude closing below $97 a barrel on the New York Mercantile Exchange on Aug. 6, the lowest settlement price since February.