Lifestyle
Charging a Tesla Model S Might Be Costing More Than You Think

When you fill up a normal ICE car you know exactly what your costs are for the fuel. With an electric vehicle it is not that simple. There is a charging efficiency factor that comes into play which means that the reported amount of energy used could be understated and lower than the actual energy used. In a previous post I wrote about installing an EKM Digital Submeter on my NEMA 14-50 outlet to measure actual power usage of the Model S against the reported power displayed on the driver’s digital dash display. A month later and armed with more data, the energy loss I’m seeing is larger than I had originally expected.
Test Setup
I charge at home 99% of the time and in the last three months I’ve logged 7,500+ miles driven, one trip to the Supercharger and two visits to the Tesla store’s High Power Wall Connector. I have a professionally installed NEMA 14-50 outlet at home. I’m using the factory supplied Universal Mobile Connector (UMC) as the cable between the outlet and the car. An EKM digital sub meter measures actual draw from the outlet and is accurate to within 1% and does not add any measurable load of its own.
Methodology
On the “anniversary date” of taking delivery of my Model S I recorded all of the pertinent info that was displayed before resetting the Trip A meter. Before driving the next day I record the reading on the EKM meter. That way I’ve got the mileage and the Tesla reported power usage over the period driven. This process will let me see a bunch of information that I plan on tracking over time, as follows:
- Monthly miles driven
- Monthly kWh used as reported by the Model S
- Monthly kWh used as reported by the EKM meter
- Monthly Average energy used
I plan on using this information to look at how average energy used changes as the months/temperature changes and perhaps as the Model S gets more miles on it. While I don’t drive consistently on any given day (test drives, special trips and the like), the numbers will average out and my driving style is not likely to change much after 30 years of driving (yeah I’m getting old but the Model S makes me feel young again!). I also drive pretty consistent patterns of commuting with a lot of miles to the same places which helps average out the special trips to locations with different terrain/conditions. Basically, while the conditions aren’t perfectly stable over time, the averages and data from this real world testing will be pretty accurate.
The Data
The last period (6/21 – 7/21) was my first full period with both the car and the EKM meter. A month of driving and charging, especially with the miles and kWh’s involved is a decent period over which to look at the results versus the 2 days from my prior blog post. Here’s the data: In the above table you can see that the Model S reported 728 kWh used during the period but the meter reported 894 kWh used. This means my charging efficiency is only about 82% and electric usage (and cost) is 23% higher than I may have expected based on the readings the Model S provides. For that month this is an extra $26 of charging cost which is a small number but a notable percentage of the total. The good news is that even using this larger kWh number, the savings versus driving my old ICE car for energy alone comes in at $334 — I’m saving $334/month in gas driving my Model S!
Summary
Research suggests that an average charging efficiency loss ranges between 10-12%. Over this one month period of over 2,400 miles I'm seeing an 23% loss using the standard home charging setup that Tesla recommends. Many people quote an 85% charge efficiency for Tesla, and Tesla's own charging calculator appears to assume a 91% charging efficiency which is quite different than the 82% actual charge efficiency I've measured and significantly worse than the average industry charging efficiency. It would be great to see another Model S owner do a similar test using the HPWC setup at home and see if they get results similar to what Tesla is providing. I'd love to do the test but I'm not quite ready to shell out $1,200 plus electrician costs to get that data -- assuming a cost of about $3,000 all in it would take me over 20 years to break even assuming the HPWC improves my efficiency by 10%. From the results above, my conclusion is that the Model S charging efficiency using the standard home setup is 5-10% worse than other EVs on the market.
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Lifestyle
Tesla Semi futuristic sci-fi acceleration sound will never get old
Videos that capture the Semi moving at speed are most notable due to their sheer cool factor.

The Tesla Semi is not yet in mass production, but the company has accumulated over 7.9 million miles across its test fleet. With Tesla using the Semi for its operations, it is no surprise that sightings of the Class 8 all-electric truck have been abounding.
These sightings from Tesla enthusiasts vary, but those that capture the the Class 8 all-electric truck moving at speed are most notable, possibly due to their sheer cool factor.
Tesla Semi’s Roar
There is something that just stands out with the Semi, particularly on the road. While the Semi does not have the Cybertruck’s brutalist, angular design, it is still very striking because it’s such a massive machine that moves far too quietly for its size. This is, of course, one of the reasons why the vehicle also becomes extra noteworthy when it fires up its electric motors and accelerates.
Take this video from Tesla Owners Silicon Valley, for example, which shows the all-electric hauler accelerating while pulling what appears to be a full load. In these situations, the Tesla Semi actually becomes audible, but unlike traditional diesel-powered truck, the Class 8 all-electric truck “roars” with its own, unique futuristic, sci-fi sound. In such situations, one could feel the Semi’s raw power, which comes from its three independent motors on its rear axles.
Tesla Semi Ramp
Tesla has been promoting the Semi quite a bit as of late, and recent reports have suggested that the company is putting in a lot of effort to prepare the vehicle for its production in Nevada. Tesla’s Careers website has gone live with over 80 Semi-related job openings recently as well, and a recent report has suggested that Tesla has ramped the Semi’s factory workers in Nevada to over 1,000 employees.
The company has even shared an update video of the Semi factory’s progress near Giga Nevada, as well as the design of the vehicle’s new logo. The Semi’s updated logo is quite interesting as it features elements from the Tesla Model 3’s first logo, which was unveiled way back in 2016.
Lifestyle
Elon Musk jokes he will join Mr Beast’s “100 Men vs 1 Gorilla” challenge
It’s a good sign, if any, that the overworked Musk is becoming a bit more lighthearted again.

Following the first quarter Tesla earnings call, CEO Elon Musk seems to have become a bit more relaxed—relaxed enough to joke about fighting a gorilla with 99 other people, at least.
It’s a good sign, if any, that the overworked Musk is becoming a bit more lighthearted again and not too busy picking fights with politicians on social media.
The Viral 100 Men vs 1 Gorilla Challenge
Over the weekend, a post on social media platform X went viral. The post itself was quite simple, with user @DreamChasnMike stating that he thinks 100 men could beat one gorilla. “Everybody just gotta be dedicated to the sh*t,” the X user joked. The post exploded on the platform, garnering 284 million impressions as of writing.
The silly question also triggered a massive debate about whether 100 men would really stand a chance against a literal gorilla. Some users even lamented that the premise was a sign of male hubris. Nevertheless, the question proved to be a fun topic on X, with some more dedicated users even posting simulated videos of what the “100 Men vs 1 Gorilla Challenge” could look like.
Mr. Beast and Elon Musk Join In
The premise is quite similar to other viral videos from noted YouTube creator Mr. Beast, so it was no surprise that edited images of Mr. Beast YouTube thumbnails with “100 Men vs a Gorilla” also started spreading on the social media platform. Mr. Beast, who tends to be game to such silly ideas, actually reposted the edited image, joking “Need 100 men to test this, any volunteers?”
In true Elon Musk fashion, the Tesla and SpaceX CEO noted that he would join the challenge. “Sure, what’s the worst that could happen” Musk wrote in his post on X. Musk’s reply triggered quite a few laughs on X, with some stating that the world probably still needs the CEO.
While silly, Musk’s comment and his recent, more frequent posts about his companies’ products like Starlink and Grok have been received well by his supporters. Over the past months, after all, Musk has been very political and quite confrontational on social media. With Musk soon taking a step back from the Department of Government Efficiency’s (DOGE) daily operations, however, it seems like X will soon get a more tempered and lighthearted Elon Musk once more.
Lifestyle
Possible first glimpse of Tesla “Model 2” affordable car in Fremont Factory
The models that Tesla will release in the coming months will resemble the company’s current lineup.

During the Q1 earnings call, Tesla VP of Vehicle Engineering Lars Moravy set expectations on the design of the affordable models that the company is expected to launch this 2025. As per the Tesla executive, the models that Tesla will release in the coming months will resemble the company’s current lineup.
Drone footage from the Fremont Factory earlier this month might have provided the EV community its first potential glimpse at Tesla’s affordable cars–fondly dubbed by EV fans and analysts as the “Model 2” or even “Model Q”–or at least their components and overall shape.
The Sighting
Tesla watcher and drone operator Met God in Wilderness, who has been posting aerial videos of the Fremont Factory for years now, recently shared some footage from his drone flyovers this month. While the Fremont Factory was abuzz with activity as usual, a couple of rather strange vehicles were quickly spotted by EV watchers on social media.
During the drone operator’s flyover on the 17th, for example, an unfinished vehicle could be seen parked next to what appeared to be fully-built Model S and Model Y units. What was especially interesting was the vehicle’s roof, which seemed to be slightly narrower than the Model Ys around it. Based on the video, at least, the vehicle seemed to be shaped like a crossover as well.
Footage from the 24th of April also proved quite interesting, with the drone operator capturing footage of another cryptic vehicle. Unlike the mysterious, unfinished, crossover-esque car spotted on the 17th, this particular unit seemed to have a more sloping rear, at least based on the shape of its covering.
What Lars Moravy Said
In Tesla’s Q1 2025 Update Letter, Tesla noted that “plans for new vehicles, including more affordable models, remain on track for start of production in the first half of 2025.” Tesla also noted that the new vehicles will utilize aspects of its next generation and its current platforms. They will also be produced on the same manufacturing lines as its present vehicle lineup, likely the Model Y and Model 3.
During the earnings call itself, Moravy specifically stated that the new models that would come out in the next months would resemble the company’s current vehicles. They will, however, be affordable. “Models that come out in next months will be built on our lines and will resemble, in form and shape, the cars we currently make. And the key is that they’ll be affordable, and you’ll be able to buy one,” Moravy stated.
Watch the drone operator’s footage from April 17 below.
The drone operator’s footage from April 24 can be viewed below.
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