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CINCINNATI — Truck and engine makers said that meeting the federal government’s greenhouse-gas standards that take effect in 2017 while still complying with the 2010 emissions rule is a difficult challenge and could result in more “hard programming” of engine settings and fewer choices for fleets in their tractors.

The consumer price index rose 0.6% in September for a second month, the Labor Department said Tuesday.

An hours-of-service waiting time exemption for drivers of “specially constructed” oil-field operations trucks should be extended to include such other oil and gas operations trucks such as those that deliver sand and water, several motor carriers and trade association officials told federal regulators.

The U.S. trade deficit grew by 4.1% in August, the Commerce Department said Thursday.

The Federal Motor Carrier Safety Administration has pushed back the deadline for public comment about changes to the hours-of-service rules for oilfield haulers.

Managers of the nation’s largest shipper-owned truck fleets are taking steps to counter the rising cost of fuel and equipment by more closely monitoring drivers and using new data collection techniques to make better routing decisions and improve compliance with safety and environmental regulations.

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.

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