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The average national price of retail diesel fuel held at $3.28 a gallon from a week ago, the Department of Energy said Monday.

Wholesale inventories rose 1.1% in December, though sales fell 0.7%, the Commerce Department said Friday.

Freight forwarder UTI Worldwide plans to cut its workforce by 7%, eliminate divisions in the Americas and Africa and restructure management in an effort to its boost its profitability, the company said Friday.

Three of the primary measures of large truck safety fell to record lows in 2006, American Trucking Associations said Friday.

Navteq Corp., a maker of maps used in transportation navigation, said its fourth-quarter profit rose to $61.9 million, or 61 cents per share, from $42.9 million, or 45 cents, a year earlier.

Truckload carrier P.A.M. Transportation Services said it lost $840,000, or 8 cents a share, in the fourth quarter, compared with net income of $4.3 million, or 41 cents, a year earlier.

Vitran Corp. said Friday its fourth-quarter profit was $1.7 million, or 12 cents a share, down from $5 million, or 37 cents, a year earlier.

About 2,500 members of United Auto Workers walked off their jobs at the only Volvo-Mack over-the-road assembly plant in North America, shutting down production Feb. 1, after the union and Volvo Trucks North America failed to agree on a new contract.

ORLANDO, Fla. — Uncertainty about the life cycle of key emission control components and higher maintenance costs have emerged as the top concerns fleets have with 2007 heavy-duty diesel engines, maintenance and equipment heads at several major carriers said here.