Diesel fell 2.4 cents to $3.886 a gallon, its first decline in four weeks, the Department of Energy reported Jan. 13.
Diesel had gained almost 4 cents in the previous three weeks of increases, and its current price is about equal to its $3.87 average of the past two months.
Trucking’s main fuel is less than a penny lower than it was a year ago.
The latest decline coincided with the lowest oil prices in eight months. Crude futures closed at $91.80 a barrel Jan. 13 and $91.66 on Jan. 9, according to Bloomberg News — marking the first times oil has finished below $92 on the New York Mercantile Exchange since May.
Gasoline, meanwhile, dipped a half-cent to $3.327 a gallon, also its first downturn in four weeks, DOE said following its weekly survey of filling stations.
Gas had gained 9.3 cents in the past three weeks, and its price is now 2.4 cents higher than the same week a year ago.
DOE reported last week that inventories of gasoline and distillates, which include diesel, improved for the previous week.
Each week, DOE surveys about 400 diesel filling stations and 800 gasoline stations to compile national average prices.