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Ultra-low-sulfur diesel, the standard fuel of heavy-duty trucking since late 2006, has more energy content than engineers originally had expected, a welcome surprise, according to a study from the American Transportation Research Institute.

The average retail price of diesel fuel remained relatively stable for a second week, dropping 1.8 cents to $2.296, the U.S. Department of Energy reported.

Most new heavy-duty trucks sold in the United States and Canada, beginning when 2010 models are introduced, will use selective catalytic reduction technology to cut emissions, which will require the addition of a new fluid to work properly. And truck stops throughout the nations are trying to prepare to meet the demand for this new product.

Forward Air Corp. lowered its fourth-quarter earnings guidance, citing “severely worsening economic conditions” in the second half of the quarter.

Cummins Inc. unit Cummins Emission Solutions said it will partner with a technology company for 2010 engine controls and that it will close a Wisconsin plant.

The average price of U.S. retail diesel fuel rose last week for the first time in more than three months, inching up 2.3 cents a gallon to $2.314, the Department of Energy reported.

A top U.S. Environmental Protection Agency official said last week that the agency has “absolutely no intention” of granting the request by truck and engine manufacturer Navistar Inc. for a two-year delay in implementing 2010 federal diesel emission standards for new heavy trucks.

The Bloomington, Minn., School District closed all of its schools Thursday because biodiesel fuel gelled and clogged in the district's buses, the Minneapolis-St. Paul Star-Tribune reported.