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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.

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.

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.

KIRKLAND, Wash. — Kenworth Truck Co. continued its push into the natural gas market, providing journalists and customers an opportunity earlier this month to test multiple models with engines that run on the fuel that’s garnering significant attention from the trucking industry.

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.

U.S. retail diesel and gasoline prices rose for the third straight week, taking back more of the substantial cost drops that dominated the second quarter of the year, the Department of Energy reported July 23.