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The average U.S. pump price of diesel exhaust fluid fell in July to the lowest level on record, according to Integer Research.

Truck and engine manufacturer Navistar International Corp., pressed to find a way to offer engines that comply with federal emissions regulations, said last week that it has reached an agreement to use Cummins Inc. selective catalytic reduction technology for its 13-liter engines and offer Cummins 15-liter engines in some of its International brand trucks.

U.S. retail diesel and gasoline prices rose for the fourth straight week, the Department of Energy reported, although the rate of the increases slowed.

Oil jumped by more than $4 Friday, the biggest gain in a month, following a report that more U.S. jobs were created in July than economists had expected, Bloomberg reported.

The California Air Resource Board will be conducting increased heavy duty diesel truck inspections throughout August at scales, truck stops and fleet facilities.

Federal officials have approved a permit for the southern leg of the Keystone XL pipeline that will run from an oil refinery in Cushing, Okla., to the Texas coast, the Associated Press reported.

Heavy-duty truck manufacturers have improved the fuel efficiency of their tractors through a combination of new technologies, powertrain improvements, enhanced aerodynamics and efforts to reduce rolling resistance.