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WASHINGTON — The Environmental Protection Agency privately challenged the Trump administration’s rationale for freezing Obama-era mileage standards, saying the proposal actually would increase U.S. highway deaths.

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.

New rules limiting the amount of sulfur allowed in shipping fuel is expected to cut demand for high-sulfur fuel oil and the sour crude that yields it. In Canada, that could extend — or worsen — the biggest price slump in nearly five years.

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.