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A Navistar Inc. spokesman said that a “coalition is building” around the company’s call to the incoming Obama administration to ease 2010 emissions mandates, but the Environmental Protection Agency said its tightened standards would go into effect without delays.

Volvo AB and Daimler AG are producing global heavy-duty engine platforms for use in North America, Europe and Asia, and other manufacturers plan to introduce their own versions, pushed by converging emission regulations, the need to reduce research and development costs and to take advantage of economies of scale, according to industry analysts and executives.

Diesel fuel prices continued to slide last week, with the U.S. average falling 4.9 cents to $2.615 a gallon, according to the Department of Energy.

Truck and engine maker Navistar Inc. said it will take a “leadership role” in trying to convince Congress and the new administration to delay full implementation of 2010 heavy-duty truck engine emission mandates.

Clean Energy Fuels Corp. has started up its California LNG Plant in Boron, Calif., the company said Monday.

Navistar International Corp. will use federal emission credits to enable its new Class 8 engine to meet 2010 federal emission standards, although the engine could be set up to comply with the regulation without the credits, a Navistar executive said.

Pacer International announced last week that its subsidiaries will deploy 230 new clean trucks this month to comply with Southern California port regulations.