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Diesel emission standards change again in January 2010, but unlike the previous modifications when all manufacturers used essentially the same emission-controlling technology, medium-duty truck buyers next year will have a choice of competing systems.

The accuracy of the Global Positioning System could be compromised as early as next year if the U.S. Air Force cannot meet an ambitious schedule for space and ground infrastructure deployment, according to a new report from the Government Accountability Office.

BOSTON — Volvo Trucks joined the argument over allowing longer, heavier trucks on U.S. highways, saying Congress should allow them on the interstate system to relieve congestion, increase productivity, conserve fuel and cut greenhouse gas emissions.

SAN DIEGO — A “perfect storm” of a weak economy, high fuel prices and governmental missteps have led to a 70% drop in new-truck sales in North America, according to Jim Hebe, senior vice president of North American sales for Navistar.

Federal researchers said they have confirmed manufacturers’ claims that single wide tires can boost a truck’s fuel economy, but one tire expert said they may not be suitable for every fleet.

Several companies that blend diesel exhaust fluid, the urea solution used in truck engines with selective catalytic reduction systems, have had their blends certified by the American Petroleum Institute.

LOUISVILLE, Ky. — Navistar Inc. said it soon will introduce a 15-liter engine, which combines the fuel-induction technology of its 11-liter and 13-liter MaxxForce models with the block and other basic components of a Caterpillar C15 power plant.

LOUISVILLE, Ky. — Cummins Inc. said it is confident the Environmental Protection Agency will approve the company’s use of copper zeolite in engines de-signed to meet 2010 emission rules, removing any potential roadblock for the new models.

Transportation officials in Colorado said initial feedback from commercial drivers who have used the AutoSock, a heavy-duty cloth covering for tires, has been positive, and it could become an accepted alternative to metal snow chains.

The U.S. Environmental Protection Agency last week took the first step toward creating a national cap-and-trade system, proposing a new rule that would establish a federal system for reporting carbon dioxide emissions and other greenhouse gases produced by large stationary and mobile sources.