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EPA EV range estimates challenged by new research

Tesla Cybertruck spotted on the Highway

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The Society of Automotive Engineers (SAE) and Car and Driver have published a report challenging the EPA’s EV range estimate calculations.

As revealed by countless surveys, one of the most critical specifications for EV buyers is how far the vehicle can drive on a single charge. But often, without a way to test it themselves, EV customers are forced to use the number printed on the window sticker or posted on the EPA’s website, which is the agency that has typically tracked and measured these capabilities. Now, those numbers are being challenged by research from SAE International and the Car and Driver magazine.

According to the research published by Car and Driver, the EV range estimates published by the EPA are, on average, 12.5% higher than the numbers they achieved in their testing, which could be quite a shock for a car buyer. In comparison, Car and Driver’s ICE vehicle testing was only 4% off of the EPA’s estimates, which were actually lower than their testing results.

As noted in the published report, this range discrepancy was entirely expected, thanks to the difference in testing methodology, but that was ostensibly the point. First, because the EPA only provides consumers with a single highway/city combined range number – which is slightly weighted toward city driving (55/45) – customers who predominantly drive on the highway will consistently fail to reach the estimated range number. Further, the inverse is true for drivers who spend most of their time in the city.

The EPA was not immediately available to comment to Teslarati on their testing procedures.

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The second discrepancy point highlighted in the paper concerns testing methodology, in which the EPA currently provides options for automakers on how to complete the testing. This means different automakers, or even different models, will be dramatically different in their estimated range compared to their real-life range, adding to customer confusion.

Nowhere is this second point seen better than in highway testing, which is once again significantly skewed upwards. Instead of testing the vehicles at actual highway speeds, 75mph (the speed used in Car and  Driver’s testing), automakers test at a lower speed and then multiply their results by a “reduction factor,” determined by how many runs the vehicle completes.

Third and perhaps worst of all, these slight discrepancies, mixed with automakers’ self-reporting their results, can mean that different brands take wildly different approaches and report drastically different figures compared to real life. Perhaps the starkest example found by Car and Driver was the difference in EV range reported by Tesla and Porsche. While the German brand was incredibly conservative with its range estimates, Tesla was slightly more generous than the testing completed by the car magazine.

Luckily, according to Car and Driver, fixing these issues would be fairly simple. First, the paper suggests providing consumers with an EV highway and city range number, with each of those estimates being found by separate testing, similar to current gas vehicle testing. Second, removing or adjusting the “reduction factor” toward more realistic use (higher highway speeds) will provide a more accurate number to consumers. And third and finally, enforcing more consistent testing standards between automakers will help consumers more accurately gauge the capabilities of the cars they are buying.

What do you think of the article? Do you have any comments, questions, or concerns? Shoot me an email at william@teslarati.com. You can also reach me on Twitter @WilliamWritin. If you have news tips, email us at tips@teslarati.com!

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Will is an auto enthusiast, a gear head, and an EV enthusiast above all. From racing, to industry data, to the most advanced EV tech on earth, he now covers it at Teslarati.

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Tesla Supercharger access has proven to be a challenge for one company

Interestingly, it seems to be the Volkswagen brand specifically that is having issues with compatibility with Tesla Superchargers. Other brands under the VW umbrella, like Audi and Porsche, have already gained access to the charging network.

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Credit: MarcoRP | X

Tesla Supercharger access has proven to be quite the challenge for one company, as it continues to delay the date that it will enable its owners to charge at the most expansive network in the world.

Tesla Superchargers have been opening up to other brands for well over a year, and many car companies that are manufacturing electric vehicles now have access to the vast network that has over 70,000 locations worldwide.

Tesla to launch Supercharger access for VW owners later this year

However, one brand has experienced some issues with what it is calling “technical challenges,” specifically failing to enable cross-compatibility between its vehicles and Tesla Superchargers.

Volkswagen has had to delay its ability to enable customers to charge at Superchargers because there have been some difficulties getting things to run smoothly. A report from PCMag cites a quote from a Volkswagen spokesperson who said there are still plans to deliver this year, but there have been some delays:

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“Volkswagen looks forward to making it possible for ID. Buzz and ID.4 vehicle owners to gain access to the Tesla NACS Partner Superchargers. The timeline has been delayed by technical challenges, and we ask for customers’ patience. We still expect to deliver access this year.”

Interestingly, it seems to be the Volkswagen brand specifically that is having issues with compatibility with Tesla Superchargers. Other brands under the VW umbrella, like Audi and Porsche, have already gained access to the charging network.

Volkswagen EV owners will need to use an official VW adapter to access the Tesla Supercharger Network once the issues are resolved. It still plans to launch access to its owners later this year, but its spokesperson did not announce any planned timeline.

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Tesla Giga Berlin makes big move amid strong sales and demand

“We currently have very good sales figures and have therefore revised our production plans for the third and fourth quarters upwards.”

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Credit: Tesla Manufacturing

Tesla is making a big move at its factory in Germany, known as Giga Berlin, as managers at the plant have indicated the company plans to increase its production rate for the remainder of the year.

Giga Berlin is responsible for manufacturing Model Y vehicles for several markets worldwide, including those outside of Europe. It was opened in March 2022, and it recently built its 500,000th Model Y in March and its 100,000th new Model Y just three weeks ago.

Due to some encouraging sales figures in the markets it provides vehicles for, Tesla said it is planning to increase production at the factory for the remainder of the year.

Andrè Thierig, plant manager at Giga Berlin, said to German news outlet DPA on Sunday that market data has encouraged a move to be made regarding the production at the factory:

“We currently have very good sales figures and have therefore revised our production plans for the third and fourth quarters upwards.”

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It is interesting to see this kind of narrative from Thierig, especially as data has shown Tesla has struggled in various markets, including Germany, this year.

Sales drops have been reported, but other markets are holding strong, especially those in Northern Europe, such as Norway, where the Model Y saw a nearly 39 percent increase in sales in August compared to the same month the previous year.

Tesla Model Y leads sales rush in Norway in August 2025

Gigafactory Berlin supplies vehicles for other markets, such as Canada, Australia, and New Zealand, which are strategically important to avoid tariffs. It also builds cars for the Middle East.

Thierig reiterated this point during the interview with DPA:

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“We supply well over 30 markets and definitely see a positive trend there.”

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Elon Musk

Tesla analyst says Musk stock buy should send this signal to investors

“With Musk’s (Tesla stock) purchase, combined with the upward momentum for delivery expectations and robotaxi rollout, we are becoming more bullish.”

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(Credit: Tesla)

Tesla CEO Elon Musk purchased roughly $1 billion in Tesla shares on Friday, and analysts are now breaking down the move as the stock is headed upward.

One of them is William Blair analyst Jed Dorsheimer, who said in a new note to investors on Monday that Musk’s move should send a signal of confidence to stock buyers, especially considering the company’s numerous catalysts that currently exist.

Elon Musk just bought $1 billion in Tesla stock, his biggest purchase ever

Dorsheimer said in the note:

“With Musk’s (Tesla stock) purchase, combined with the upward momentum for delivery expectations and robotaxi rollout, we are becoming more bullish. This purchase is Musk’s first buy since 2020. To us, this sends a strong signal of confidence in the most important part of Tesla’s future business, robotaxi.”

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Musk putting an additional $1 billion back into the company in the form of more stock ownership is obviously a huge vote of confidence.

He knows more than anyone about the progress Tesla has made and is making on the Robotaxi platform, as well as the company’s ongoing efforts to solve vehicle autonomy. If he’s buying stock, it is more than likely a good sign.

Tesla has continued to expand its Robotaxi platform in a number of ways. The project has gotten bigger in terms of service area, vehicle fleet, and testing population. Tesla has also recently received a permit to test in Nevada, unlocking the potential to expand into a brand-new state for the company.

In the note, Dorsheimer also touched on Musk’s recent pay package, revealing that William Blair recently met with Tesla’s Board of Directors, who gave the firm some more color on the situation:

“We recently participated in a meeting with Tesla’s board of directors to discuss the details of Musk’s performance package. The board is confident of its position in the Delaware case and anticipates a verdict by end of year. It does not expect a similar situation to occur under new Texas jurisdiction. Musk has the board’s full support, and we expect he’ll get more than enough shareholder support for this to pass with flying colors.”

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Tesla stock is up over 6 percent so far today, trading at $421.50 at the time of publication.

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