Diesel’s national average price fell 2.6 cents to $3.892 a gallon, the sixth straight downturn and biggest decline in more than a year, the Department of Energy reported June 9.
Gasoline also fell, by 1.6 cents to $3.674 a gallon, reversing the exact same increase from a week ago.
Despite the diesel drop — which left it under $3.90 for the first time since January — trucking’s main fuel is 4.3 cents higher than the same week last year.
Diesel has fallen 8.3 cents since late April, DOE figures showed. It is almost 13 cents below its level of March 10, $4.021, which was the highest in almost a year.
The drop was the biggest single-week downturn since diesel fell 3.6 cents April 29, 2013, to $3.851. Diesel was then declining from its $4.159 price of nine weeks before that, which was its highest in more than four years.
This week’s declines were broad-based around the country, with all of DOE’s national averages dropping by more than 2 cents except the Gulf Coast, although that region posted the lowest price, at $3.769.
The Central Atlantic — a subregion of the East Coast — had the biggest decline, with the price down 3.7 cents, although that area had the highest overall price at $4.079.
Each week, DOE surveys about 400 diesel filling stations and 800 gasoline stations to compile national average prices.