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The average retail price of diesel fuel jumped 11.4 cents to $2.79 a gallon, the largest one-week jump in 18 months, the Energy Department reported.

The U.S. average retail price of diesel fuel dipped by 0.5 cent to $2.676 a gallon last week, its second straight tiny decline, the Department of Energy said.

The average national price of retail diesel fuel fell for a second straight week, dipping 0.5 cent to $2.676 a gallon, the Department of Energy reported Monday.

Following six straight weekly increases, the average national price of retail diesel fuel dipped 0.4 cent to $2.681 a gallon, the Department of Energy reported Monday.

For decades, diesel engines — prized for their durability and pulling power — have dominated broad segments of the heavy truck and equipment markets. As gasoline prices rose in the 1970s, diesels made quick inroads in light-duty markets as well.

The average national price of diesel fuel gained another 5.9 cents from last week in rising to $2.685 a gallon, a sixth straight increase, the Department of Energy said Monday.

The average national price of diesel fuel jumped 7.5 cents to $2.626 a gallon, while gasoline soared 12.2 cents from last week to $2.505, the Department of Energy said Monday.

Just three days after saying it would suspend producing diesel engines for Ford Motor Co., Navistar International Corp. said it would resume production because of a court order from a Michigan judge.