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.
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!
Elon Musk
Tesla Semi fleet from Frito-Lay gets more charging at Bakersfield factory

Among the several companies that have had the opportunity to add Tesla Semi all-electric Class 8 trucks to their fleets earlier than others, the most notable is arguably Frito-Lay, which has utilized the vehicle for a couple of years now.
However, as their fleet is making more local runs and there are undoubtedly plans to expand to more Semi units, the company has recognized it needs additional Megachargers to give juice to their trucks.
As a result, Frit-Lay decided to build more chargers at their Bakersfield, California facility, according to new permits filed by Tesla:
🚨 Frito-Lay is building an 8-stall Megacharger array at its factory in Bakersfield, California https://t.co/qARfJjogXF pic.twitter.com/gvorIVxsoc
— TESLARATI (@Teslarati) April 18, 2025
There are already chargers at the company’s Modesto, California, factory, but Bakersfield is roughly three hours south of Modesto.
Interestingly, Tesla is calling the chargers “Semi Chargers” in the filing, potentially hinting that it is no longer referring to them as “Megachargers,” as they have been in the past. This is a relatively minor detail, but it is worth taking note of.
In 2022, Frito-Lay began installing these chargers in preparation for the Semi to become one of the company’s main logistics tools for deliveries in California and surrounding states.
Frito-Lay is not the only company that has chosen to utilize the Tesla Semi for these early “pilot” runs. PepsiCo has also been a company that has used the Semi very publicly over the past two years.
Additionally, the Tesla Semi participated in the Run on Less EV trucking study back in late 2023, where it managed to complete a 1,000-mile run in a single day:
Tesla Semi logs 1,000-mile day in Run on Less EV trucking study
Tesla is planning to ramp production of the Semi late this year. On the Q4 2024 Earnings Call, VP of Vehicle Engineering Lars Moravy said the company would be focusing on the first builds of the Semi’s high-volume design late this year before ramping production in the early portion of 2026:
“We just closed out the Semi factory roof and walls last week in Reno, a schedule which is great with the weather. In Reno, you never know what’s going to happen. But we’re prepping for mechanical installation of all the equipment in the coming months. The first builds of the high-volume Semi design will come late this year in 2025 and begin ramping early in 2026.”
Tesla will build these units at a new Semi production facility located in Reno near its Gigafactory. The company is getting closer to finishing construction, as a drone video from this morning showed the facility is coming along at a good pace:
🚨Tesla Semi factory progress update: pic.twitter.com/dlzIjKwfT3
— TESLARATI (@Teslarati) April 18, 2025
News
Tesla Cybercab no longer using chase vehicles in Giga Texas
Elon Musk expects Tesla to produce about 2 million Cybercab units per year.

The Tesla Cybercab is the company’s first vehicle that is designed solely for autonomous driving. And while the spacious two-seater is expected to start volume production in 2026, the vehicle’s development seems to be moving at a steady pace.
This was hinted at in recent images taken by a longtime Tesla watcher at the Giga Texas complex.
Tesla Cybercab Production
The Cybercab will likely be Tesla’s highest volume vehicle, with CEO Elon Musk stating during the company’s Q1 2025 All-Hands meeting that the robotaxi’s production line will resemble a high-speed consumer electronics line. Part of this is due to Tesla’s unboxed process, which should make the Cybercab easy to produce.
Elon Musk expects Tesla to produce about 2 million Cybercabs per year. And while the vehicle is expected to see volume production at Giga Texas next year, the CEO noted that the vehicle will be manufactured in more than one facility when it is fully ramped.
No More Chase Cars
While the Cybercab is not yet being produced, Tesla is evidently busy testing the vehicle’s fully autonomous driving system. This could be hinted at by the Cybercabs that have been spotted around the Giga Texas complex over the past months. Following last year’s We, Robot event, drone operators such as longtime Tesla watcher Joe Tegtmeyer have spotted Cybercabs being tested around the Giga Texas complex.
At the time, videos from Giga Texas showed that the driverless Cybercabs were always accompanied by a manually driven Model 3 validation chase car. This was understandable considering that the Giga Texas complex features pedestrians, other cars, and construction areas. As per the drone operator in a recent post on social media platform X, however, Tesla seems to have stopped using chase cars for its Cybercab tests a few weeks ago.
Aggressive Tints
The reasons behind this alleged update are up for speculation, though it would not be surprising if the Cybercab’s autonomous driving system could now safely navigate the Gigafactory Texas complex on its own. Interestingly enough, the Cybercabs that were recently photographed by the drone operator featured very aggressive tint, making it almost impossible to make out the interior of the robotaxi.
This is quite interesting as other Cybercabs that have been spotted around Giga Texas were only equipped with semi-dark tints. One such vehicle that was spotted in February was even speculated to be fitted with an apparent steering wheel.
News
Tesla reiterates FSD’s biggest advantage, even if it’s still Supervised
Even in its current Supervised state, FSD is already pretty life-changing.

Tesla Full Self Driving (FSD) has a ton of potential. Once it is rolled out as an Unsupervised system, it could change the transportation sector. But even in its current Supervised state, FSD is already pretty life-changing.
This was highlighted recently by the electric vehicle maker through its official Tesla account on social media platform X.
Tesla FSD Unsupervised
Tesla’s self-driving aspirations are expected to come to fruition with the release of FSD Unsupervised, which is currently already being used in the Fremont Factory and Giga Texas. With FSD Unsupervised, Teslas are able to navigate from the end of their production lines to the facilities’ outbound lots without a human driver.
Tesla has previously noted that FSD Unsupervised should see its initial release in Texas and California this year. As noted by Tesla in a post on X, autonomy, when deployed at scale, does not just make cities more livable. It also gives back time to people. This is what makes autonomous driving systems potentially world-changing.
Still Supervised, But Already Useful
FSD today, however, is still Supervised, which means that it still requires constant attention from the driver. This is one of the main points of criticism from Tesla skeptics, as FSD’s current Supervised nature is typically used to argue that it is no better than other adaptive cruise control systems that other carmakers offer. As per Tesla in a follow-up post, however, FSD Supervised already makes life easier.
This is because FSD Supervised works on inner city roads, and while the driver is still observing the car to ensure that it operates well, trips could easily become a lot less tiring. This is especially true for long trips, which could take a toll on the driver if vehicles are driven manually.
“You can get a glimpse of that today: although FSD Supervised currently does require your supervision, you will still notice that your commute or long drives are suddenly so much less taxing. No constant micro-adjustments in rush hour traffic. No frustration. Car does it all for you,” Tesla wrote in its post on X.
-
News2 weeks ago
Tesla rolls out new, more affordable trim of the Model Y Juniper in U.S.
-
News2 weeks ago
Tesla expands Early Access Program (EAP) for early Full Self-Driving testing
-
News2 weeks ago
Tesla celebrates key milestone for 4680 battery cell production cost
-
Investor's Corner2 weeks ago
“Nothing Magnificent about Tesla (TSLA),” claims Jim Cramer
-
News1 week ago
I took a Tesla new Model Y Demo Drive – Here’s what I learned
-
News2 weeks ago
Tesla Europe shares FSD test video weeks ahead of launch target
-
News2 weeks ago
This Tesla executive is leaving the company after over 12 years
-
News2 weeks ago
Tesla’s Giga Texas vehicles now drive themselves to outbound lot