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WASHINGTON — Americans shopped at a healthy pace in July, buying more cars, clothes and appliances, evidence that confident consumers are helping drive robust economic growth.

PetroChina, a unit of the state-owned China National Petroleum Corp., may suspend its buying of U.S. liquefied natural gas cargoes during the colder months, just as new American LNG terminals start up.

Are electric vehicles poised to break through in commercial transportation? Episode 3 of RoadSigns has the answer. Click to listen.

The U.S. average retail price of diesel inched down 0.6 cent to $3.217 a gallon while crude oil prices fell amid ongoing international currency and political issues that could sap demand.

Renewable energy company eNow announced that the National Highway Traffic Safety Administration certified its method of mounting solar power systems on truck rooftops as meeting federal safety standards.

A trailer makers group is asking a federal appeals court to require that two federal agencies state when they plan to make a final decision on a 2016 Obama-era heavy-truck greenhouse gas rule. Whether revised or kept in place, the rule would regulate trailers for the first time.

One of Oklahoma’s fastest-growing companies, Mammoth Energy Services, continued to expand in the second quarter, buying up two more companies and securing new contracts throughout the country.

Pilot Flying J is expanding its business portfolio with a move into the water, sand and crude oil-hauling business.

Hydrogen-electric truck maker Nikola Motor Co. announced it has quickly raised $100 million of a planned $200 million in C-round funding as it accelerates the scale of its operations.