Diesel prices are once again down this week, dropping an average of 39 cents a gallon since last week and by $1.114 since last year.
It's possible recent low diesel prices may start heading back up, with news that oil-producing countries plan to cut crude-oil production.
The price of on-highway diesel fuel and regular gasoline dropped slightly in the last week of 2015, capping off a year marked by falling energy prices.
Average diesel fuel prices at the pump decreased for the sixth week in a row, according to the latest numbers from the Energy Department.
Since the summer, the price of oil has plummeted 50 percent, hitting its lowest level in more than five years about a week before Christmas. Diesel has fallen from a yearly high of $4.021 in March to $3.419 in mid-December.