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The Federal Railroad Administration said the fuel efficiency of the freight-rail industry rose 22% between 1990 and 2006, and that when compared to trucks in similar routes and distances, is between 1.9 and 5.5 times more fuel efficient.

Navistar Inc., which said it has spent $600 million to develop its 2010 exhaust gas recirculation engine, said the company is losing sales of next year’s model because federal regulators “helped create the false impression” among customers that only urea-based after-treatment systems would meet 2010 federal emissions standards.

WASHINGTON — Several lawmakers, Department of Transportation officials and experts have  expressed concern with elements of a vehicle miles traveled tax, which some advocates tout as a replacement for the fuel tax. They also cautioned that a transition to VMT could be a slow process.

Retail diesel prices edged lower again last week for the third consecutive time, while gasoline prices rose, the Department of Energy reported.

Kenan Advantage Group will acquire the assets of Reinhard Transportation, a Federal Way, Wash., fuel hauler that runs 64 trucks.

WASHINGTON — Several lawmakers, Department of Transportation officials and experts have expressed concern with elements of a vehicle miles traveled tax, which some advocates tout as a replacement for the federal fuel tax, while also cautioning that a transition to VMT could be a slow process.

Requests for funding related to the Diesel Emissions Reduction Act will be accepted until Dec. 8, the Environmental Protection Agency said.