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Oil tumbled below $40 a barrel for the first time in a month, with a sell-off in equities and a stronger dollar exacerbating demand concerns as a lackluster summer driving season draws to a close.

Before Tesla Inc. CEO Elon Musk returned to the U.S. after a three-day visit to Germany, he made a final stopover to meet with one of his biggest competitors — Volkswagen AG CEO Herbert Diess.

General Motors and Honda have a deal to share vehicle platforms and technology in North America starting next year.

Three power plants planned in New York, Virginia and Ohio will test whether hydrogen can one day replace natural gas in electric generation.

Volvo Trucks North America took a step toward the widespread usage of electric trucks by expanding charging options, the company announced Aug. 26.

ETruck Transportation announced a plan to take used, diesel-powered Class 6 Freightliner models and convert them to battery-electric power.

Oil rose on signs a glut was easing with U.S. crude stockpiles shrinking for a sixth week.

Schlumberger has become the biggest oil service industry player yet to abandon frack work in North America, a sign that activity in the U.S. shale patch may never revisit previous highs.

Tesla Inc. plans to sell as much as $5 billion of shares, capitalizing on its high-flying price and on a recent stock split that made it more accessible to individual investors.

The price of diesel jumped by 1.5 cents nationwide to $2.441 a gallon, the Energy Information Administration reported Aug. 31, as much of the nation’s oil exploration and refining capacity was shut down because of two severe-weather events.