News
Tesla Semi Run On Less results really show serious BAMF performance
The Tesla Semi is proving its worth in the ongoing 2023 Run on Less Electric Depot event. In less than 48 hours, one of the Tesla Semis from PepsiCo covered a distance of 1,600 miles. As per Rocky Mountain Institute’s David Mullaney, it’s the Tesla Semi’s charging performance that is making these impressive feats possible.
When Elon Musk unveiled the Tesla Semi way back in late 2017, he made it a point to highlight that the electric Class 8 truck would be a cut above its peers. One of the slides that were shown during the event caught the eye of social media users as it stated that the Tesla Semi will feature “BAMF performance.”
“BAMF” typically means “bad *ss mother f**ker” on the internet, which is pretty much in line with Tesla’s humor. Based on the performance of the Tesla Semis at the 2023 Run on Less Electric Depot event so far, it would appear that such a description is indeed accurate for the vehicle.
PepsiCo is testing three Tesla Semi units in the 2023 Run on Less Electric Depot event. One of the trucks, Tesla Semi #3, was tracked to have done 794 miles during its second day of tests. The following day, the Class 8 all-electric truck traveled a total of 806 miles. Interestingly enough, Mullaney noted that during the nearly 48-hour period and 1,600-mile journey, Tesla Semi #3 was continuously on the move.
The Tesla Semis are not exactly running the routes with no load either. As per North American Council for Freight Efficiency (NACFE) ‘s Mike Roeth, the Tesla Semi trucks are hauling heavy loads.
“We’re tracking the beverage. It’s impressive, a fairly heavy haul at nearly 80,000 pounds. It goes to one location and drops off soda, but maybe picks up some waters, goes to another location to drop off water but pick up Gatorade. We don’t really know the payload, (but) NACFE has verified that these are fairly fully loaded when they leave and stay fairly loaded. They’re not out there gaming Run on Less,” Roeth said.
Mullaney noted that such performance is only made possible by the Tesla Semi’s battery. While Tesla has not shared the full specs of the vehicle’s battery, it is evident that the Semi can take high power charges for an extended period of time.
“PepsiCo’s Tesla Semi #3 just did 1600 miles in a little less than 48 hours, with the truck pretty much continually moving outside three brief but fruitful charges (along with two range extending mini charges). It’s really that charging that unlocks this. The early morning charge on Day 3 gets 75% SOC in about an hour (from 5% to 80%).
“That is remarkable. This isn’t just enabled by the 750 kW charger, but also the ability of the battery to take a high power charge for a long period of time. That ‘charge curve’ remaining very steep up to and beyond 80% SOC is what really unlocks the mileage we are seeing from this truck. In the old days, charging a battery like that would fry it in pretty short order,” Mullaney said.
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A Tesla Semi caught fire in Hayward, California, which caused both directions of traffic to shut down for hours before being completely reopened early on Wednesday, the California Highway Patrol said.
The fire occurred just after 5:30 local time in Hayward on Tuesday, as the Semi caught fire in the southbound lanes of I-880 before CHP officials made the decision to shut down both lanes of traffic due to potential risks from hazardous chemical smoke.
There were no injuries reported.
🚨 A Tesla Semi reportedly caught fire, with California Highway Patrol confirming. The Semi was on I-880 SB
An estimated 5,000 to 7,000 semi-truck and large commercial vehicle fires occur on U.S. roadways every year
— TESLARATI (@Teslarati) October 28, 2026
The cause of the fire is currently unknown, as neither Tesla nor the CHP have not determined a cause.
However, some images taken before the Semi was completely destroyed by the fire seem to indicate this might have been an older unit, as it appears to be one of the designs that Tesla shipped as part of its pilot program, before revising it and starting mass production just a month ago.
@Tslachan From on of the videos looks like it’s an old Semi (not the refresh version that recently started production) https://t.co/KzwmR2kXow
— Area Under The Curve 🎗️ (@AreaUnderCurve) October 28, 2026
At the time of publication, CHP had not returned our request for a comment for additional details, including the Semi involved and any potential collaboration on an investigation between the CHP and Tesla. We will update this story when we hear back from them.
The southbound lanes were reopened at 3:30 a.m. on Wednesday, with the northbound lanes opening last night a few hours after the fire began. The CHP did state that the lithium batteries were “incredibly difficult to extinguish,” according to NBC Bay Area.
The truck’s driver said that the Semi caught fire, but he did not have an explanation.
An estimated 5,000 to 7,000 semi-truck and large commercial vehicle fires occur on U.S. roadways every year.
Tesla’s launch of the “Emergency Drive Away” function a few months back offered owners a safe option to evacuate an area if they were in reasonable danger. The function finally got its first use in the real world, but it appears it was by mistake.
A video shared by u/Joshalander in the r/TeslaLounge subreddit recorded the instance from his vehicle and said the incident took place in Austin this past weekend during the city’s F1 Race.
“Was charging around 6 AM this past Sunday in Austin before heading to the F1 race and heard a pop. Looked over and saw the new emergency drive-away feature in action. Genuinely felt bad for the dude when he got out and realized what happened, since he looked exhausted and only seemed to half-read the prompts.”
🚨 Here’s the first look at Tesla’s Emergency Drive Away function in action:
Apparently this driver accidentally enabled it and drove forward; you can see the Supercharger pull with the car.
Tesla said previously this would cost up to $25k if not used properly. https://t.co/B4qQRrsO6B
— TESLARATI (@Teslarati) October 28, 2026
Emergency Drive Away unlatches the Supercharger connector from the vehicle, but still causes damage to both the car and the Supercharger. Tesla has said that it will cost up to $25,000 in repairs to have everything fixed back to normal.
Additionally, the company said that if it were not used in an emergency situation, the driver of the vehicle who activated the Emergency Drive Away feature would be responsible for all repair costs.
Tesla constitutes the following situations as reasonable justifications for activating the feature:
- You face an immediate threat to your life or personal safety.
- You must leave the area immediately.
- Exiting the vehicle is unsafe.
- Unplugging the charge connector would unreasonably delay your departure or expose you to a risk to your personal safety.
After using the feature, Tesla requires the driver to schedule Service so the car can be inspected.
News
Tesla’s Cybercab battery design could make robotaxis even cheaper
Tesla built the Cybercab’s battery pack with spare room for a future switch to LFP.
Tesla built the Cybercab’s battery pack with empty space inside it on purpose, and the reason points to a cheaper robotaxi down the road.
Robert Sumpf, Tesla’s director of mechanical design engineering for battery modules and packs, said the extra room beside and beneath the Cybercab’s modules was left there so the company can move to lithium iron phosphate cells later. “So, we protected this pack to go to an even lower energy dense chemistry as we scale and need to bring LFP into the platform,” Sumpf said in a Cybercab deep dive with Munro Live.
The Cybercab runs on Tesla’s own 4680 cells with a nickel chemistry today. LFP cells store less energy for their size, so a straight swap would cut range. The reserved space lets Tesla add more LFP cells to make up the difference. In return, Tesla would get cells that cost less, run cooler and survive more charge cycles. LFP became the most used EV battery chemistry in the world last year.
Not all of that room was planned for a chemistry change. Lars Moravy, Tesla’s Vice President of Vehicle Engineering, said part of it exists because “we didn’t need as many batteries as we thought we did.” Tesla told Sandy Munro in early 2025 that it was targeting a Cybercab pack under 50 kWh with close to 300 miles of range.
The pack also breaks from the structural design Tesla used in some Model Y and Cybertruck builds. Instead of potting hundreds of cells into one block, the Cybercab uses four separate, individually sealed modules, so a bad module can be replaced without scrapping the whole pack. Sumpf was blunt about the older approach, giving the Model Y structural battery “a grade D” because it was hard to build and nearly impossible to repair. He estimated a fully structural pack gains about 10% more cell volume, but said “the issue is the service cost.”
That cost matters more for a car that rarely sits parked. Cybercab chief engineer Eric Earley said replacing an entire pack “before half a million miles is a killer on cost,” which is why remanufacturing and serviceability were built into the design from the start.
The same Munro Live tour produced Moravy’s admission that the Cybercab line at Giga Texas is now outpacing Robotaxi deployments, along with a look at the robotaxi’s unorthodox paint process. Tesla is aiming to deliver the first Cybercabs to outside customers by the end of 2026, though Elon Musk has said the vast majority will stay owned by Tesla and run as a transport service.
Sumpf did not give a date for an LFP version, name a cell supplier or say how a chemistry change would affect range. For now, the 4680 cars keep piling up: Texas DMV records from Tuesday list 544 Cybercabs authorized for Tesla’s Robotaxi fleet, more than the 507 Model Ys on the same roster for the first time.
Tesla Semi catches fire in California: what we know
Tesla’s ‘Emergency Drive Away’ function gets its first use in the real world
