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Elon Musk knows how to make promises. Even by his own standards, the promises made last week while introducing two new Tesla vehicles—the heavy-duty Semi Truck and the speedy Roadster—are monuments of envelope pushing. To deliver, according to close observers of battery technology, Tesla would have to far exceed what is currently thought possible.

When Nikola Motor Co. President Trevor Milton pulled the wraps off the Nikola One prototype Class 8 truck last year and announced it would have a hydrogen fuel-cell power plant, it seemed a radical approach at the time.

Video: Cummins' Tim Proctor, left, talks with TT's Roger Gilroy about meeting the fuel economy needs of customers who are concerned about global warming.

Tesla Inc.’s superstar chief executive Elon Musk unveiled a futuristic looking electric semi truck last week that surpassed analyst expectations and weighed heavily on the shares of truck and truck component makers.

With the electronic logging device mandate quickly approaching, websites for ELD information and reviews have emerged to help carriers sift through the multitude of systems on the market and find the right fit for their operations.

Oil climbed to a two-year high as U.S. industry data showed crude stockpiles resumed declines and investors awaited a decision by OPEC on extending output cuts.

The sound — and smell — of thousands of idling trucks at the ports of Los Angeles and Long Beach could be fading if a new pilot project to convert them to part-time electric vehicles sticks.

After years of anticipation and debate, the federal mandate of electronic logging devices is nearly here.

HAWTHORNE, Calif. — Tesla’s success in the passenger-car arena has changed consumers’ perceptions and pushed the limits of what’s possible with electric cars.