• Tesla accounted for more than half of US electric-vehicle sales in the third quarter.
• Its quarterly sales increase exceeded the entire market's gain, Cox estimates show.
• High gas prices are helping EVs compete, though sales remain below last year's levels.

Tesla is taking a bigger slice of America's electric-vehicle market as high gas prices give drivers another reason to consider ditching the pump.

The company sold an estimated 144,094 vehicles in the US in the third quarter, up from 124,800 in the previous three months, according to Cox Automotive's latest sales report.

That increase was bigger than the gain for the rest of the US EV market. Put another way: Tesla drove the recovery. Everyone else, taken together, went backward.

The figures offer a new twist on the EV comeback I wrote about in July. Back then, sales had finally improved after the slump that followed the end of federal incentives in the US. Several manufacturers were benefiting, but only those with the fortitude to stick with EVs after federal government support waned.

While recovery continued in the third quarter, it became more dependent on Tesla.

Americans bought 262,649 new EVs during the period, about 6% more than in the second quarter. Sales outside Tesla fell roughly 3%, based on a comparison of Cox's latest counts with its second-quarter report.

Tesla's own sales rose about 15% from the second quarter. It supplied 54% of the country's new EVs in the third quarter, extending its lead from the previous period.

High gas prices help make the case for going electric, according to Cox.

"With gas prices well above $4 a gallon, electric vehicles look better than ever," Stephanie Valdez Streaty, Cox's director of Industry Insights, said in the company's analysis of the quarter.

Expensive gasoline and diesel make running a conventional vehicle more painful. For drivers who can charge cheaply, particularly at home, an EV offers a valuable alternative to repeated trips to the pump.

There's an important caveat to the comeback story: Sales are improving from a depressed level.

Total US EV sales were down almost 40% from a year earlier. Last year's third quarter was unusually strong because buyers rushed to claim federal incentives before they disappeared.

Tesla's sales were down about 20% against that comparison. The company remains heavily dependent on two vehicles. The Model Y and Model 3 accounted for roughly 97% of its US sales in the latest quarter.

The Cybertruck sold over 4,300 units, and Tesla has stopped making the Model S and X. (There's a Roadster, though not until 2028).

So Tesla's growing dominance isn't a story of every model flying out of showrooms, or of selling more cars than a year ago.

For now, it is winning a larger share of a smaller market. As Americans return to EV shopping, Tesla is capturing more of their business.

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• Musk described his plans for the Tesla Roadster during a 2019 exchange with YouTuber MKBHD.
• On Thursday, the Roadster did exactly as Musk promised nearly eight years ago, leaping into the air.
• While Musk missed his own deadline by years, the technology on display was just as he described it.

It's been a long time coming.

Almost eight years ago, in January 2019, Elon Musk shared plans on Twitter for Tesla's Roadster to lift off using cold-gas thrusters and ultra-high-pressure air. On Thursday, the much-anticipated Roadster did exactly that.

Musk's 2019 assertion came in response to a user sharing a GIF of the DeLorean from "Back to the Future" hovering in midair.

"The new Roadster will actually do something like this," he wrote. Tech YouTuber Marques Brownlee responded: "The thing is I feel like you’re not joking."

"I'm not," Musk said.

He then described a SpaceX-made cold-gas thruster system that uses high-pressure air stored in a composite pressure vessel.

At a SpaceX test site in Texas on Thursday, almost 8 years later, a Roadster climbed a curved ramp, dropped, rolled through the air and landed on its wheels. It used the same basic technology: cold-gas thrusters fed by high-pressure air stored in composite pressure vessels.

The 2019 exchange was not Musk’s first mention of thrusters. In June 2018, he said the Roadster would include roughly 10 of them and suggested they might allow the car to fly.

When another user proposed compressed-air cold-gas thrusters, Musk said that configuration made sense and described a pump to replenish the air.

Musk's account of the technology has proved more consistent than his production timetable. Tesla unveiled plans for the second-generation Roadster in 2017 and originally targeted production for 2020. After repeated delays, Musk said in the reveal that production will begin in 2028.

The Roadster is not Tesla’s only vehicle to miss an ambitious release target. When Musk unveiled the Cybertruck in 2019, he said Tesla expected production to begin in late 2021. The first customer deliveries took place two years later, in November 2023.

While Musk has missed plenty of deadlines, many of his more improbable technology plans have made it beyond the drawing board. In December 2020, he said SpaceX would try to catch a returning Super Heavy booster with its launch tower.

Nearly four years later, the tower’s mechanical "chopsticks" caught one for the first time.

Musk has a habit of promising the improbable well before it is ready, but eventually, the improbable part arrives.