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Navistar Inc. last week opposed the U.S. Environmental Protection Agency’s request to stop action on the truck maker’s lawsuit against the agency, which said it needed time to review its guidance on 2010 emissions regulation.

Air freight carriers appear to be pulling out of a steep dive caused by the global economic downturn over the past year, but company executives and industry observers said they expect the recovery to be slow and uneven.

Democrats on the Senate Environment and Public Works Committee last week approved a cap-and-trade bill that opponents said would cause a spike in the cost of diesel fuel.

The sudden run-up of U.S. retail diesel fuel prices moderated last week, as the average price rose just 0.7 cent to $2.808 a gallon, the Department of Energy reported. Fleet executives, however, said the respite isn’t easing their cost pressures.

GRAPEVINE, Texas — Lubricant maker Valvoline and technology firm tiwi have unveiled a program for over-the-road fleets that they guarantee will boost fuel efficiency by at least 4%.

WASHINGTON — A cap-and-trade climate bill would dramatically increase the cost of diesel fuel by as much as 88 cents a gallon, an American Trucking Associations official told a Senate committee last week.

U.S. diesel prices continued to surge as the national average rose another 9.6 cents a gallon to $2.801 last week, the highest level in nearly a year, the Department of Energy said.