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Winter Quirks with Tesla’s Cruise Control System

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I use cruise control a lot when driving. Highways, back roads, you name it. My main motive for using cruise control as much as I do is to avoid the urge to speed. After all, it’s far too easy to speed in the Model S with its smooth instant acceleration and lack of engine noise.

I did a fairly detailed review of the Model cruise control system back in the spring of 2014 but it turns out there’s more to the story than I originally thought. The frigid New England temperatures have affected battery range and the ability to use regenerative braking but little did I know that it would also affect the cruise control system.

Model S Cruise Control and Cold Weather

Cruise control is designed to maintain a constant speed without having to use the accelerator pedal. On level terrain it’s pretty reliable in terms of keeping a constant speed, but results begin to vary when going downhill with cruise control on.

In most ICE cars, cruise control will not apply the brakes but will leave the car in gear allowing the vacuum of the engine and engine braking to slow the car down. Some cars will also downshift to further increase engine braking as a means of slowing the vehicle.

The Model S on the other hand has no engine or transmission that can be used for engine braking. Because of this the Model S cruise control system relies strictly on the effects of regenerative braking to slow the car down. When regenerative braking is limited, the rate in which the vehicle decelerates is also limited which in turn limits the ability for the vehicle to automatically slow down.

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Unlimited Cruise

Tesla Model S cruise control ineffective when regenerative braking is limited due to cold weather conditions.

In the image above, I had cruise control set at 40MPH but because of the limited regenerative braking due to cold weather combined with a down hill decent, the Model S ended up plowing right past the 40 MPH mark as gravity took hold of the car. I ended up speeding 13 MPH over the cruise control  speed.

Model S owners get to choose between standard and low regenerative braking but it doesn’t make that much of a difference during cold weather conditions since regen as a whole will be limited.

There is Tesla Life Outside of California

Some California Tesla friends were surprised that I was concerned about this winter quirk. Their thought was that the Model S would operate normally after a short warm up period and this issue shouldn’t be considered a big deal. They suggested I accelerate hard a few times to get the vehicle back to “normal” temperatures but that’s easier said than done when you’re dealing with winter road conditions.

Tesla-Model-S-winter-snow

Warming 7,000 battery cells up to optimal operating temperatures takes time. Here in New England with temperatures well below the 40’s, it often takes 45 minutes of highway driving before regen kicks back in and can accept over 30kW. But more often than not I’m driving without regenerative braking because of the cold weather.

30kW of regenerative braking is needed for slowing the car down. Anything less and the car begins to gain speed as it begins to roll downhill. How fast it gains speed really depends on how limited the regen is.

If you live in colder climates and use cruise control on your Model S, beware of this winter quirk or run the risk of picking up a hefty speeding ticket.

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"Rob's passion is technology and gadgets. An engineer by profession and an executive and founder at several high tech startups Rob has a unique view on technology and some strong opinions. When he's not writing about Tesla

Investor's Corner

Tesla ‘Model Q’ gets bold prediction from Deutsche Bank that investors will love

Tesla’s Model Q could be on the way soon, and a new note from Deutsche Bank thinks it will contribute to Q4 deliveries.

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Credit: @JoeTegtmeyer/X

The Tesla “Model Q” has been in the rumor mill for the company for several years, but a recent note from Wall Street firm Deutsche Bank seems to indicate that it could be on its way in the near future.

This comes as Tesla has been indicating for several quarters that its development of affordable models was “on track” for the first half of 2025. The company did not say it would unveil the vehicles in the first half, but many are anticipating that more cost-friendly models could be revealed to the public soon.

Potential affordable Tesla “Model 2/Model Q” test car spotted anew in Giga Texas

The Deutsche Bank note refers to one of the rumored affordable models as the “Model Q,” but we’ve also seen it referred to as the “Model 2,” amongst other names. Tesla has not officially coined any of its upcoming vehicles as such, but these are more of a universally accepted phrase to identify them, at least for now.

The rumors stem from sentiments regarding Tesla’s 2025 delivery projections, which are tempered as the company seeks to maintain a steady pace compared to 2023 and 2024, when it reported 1.8 million deliveries.

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Deutsche Bank’s analysts believe the deliveries could be around 1.58 million, but they state this is a cautious stance that could be impacted by several things, including the potential launch of the Model Q, which they believe will make its way to market in Q4:

“Looking at the rest of the year, we maintain a cautious stance on volume calling for 1.58m vehicle deliveries (-12% YoY) vs. consensus +1.62m, with the timing of Model Q rollout as the key swing factor (we now assume only 25k in Q4). In China, Tesla will introduce the Model Y L this fall (6 inch longer wheel base allowing for larger 3-row seating with six seats).”

Interestingly, the same firm also predicted that the Model Q would launch in the first half of the year based on a note that was released in early December 2024.

Those estimations came from a reported meeting that Deutsche Bank had with Tesla late last year, where it said it aimed to launch the Model Q for less than $30,000 and aimed for it to compete with cars like the Volkswagen ID.3 and BYD Dolphin.

Tesla’s Q2 Earnings Call is slated for this Wednesday and could reveal some additional details about the affordable models.

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Elon Musk

Tesla preps to expand Robotaxi geofence once again, answering Waymo

Just days after Waymo responded to them, Tesla is preparing for a potentially massive expansion of the Robotaxi geofence.

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Credit: @AdanGuajardo/X

Tesla is preparing to expand its Robotaxi geofence yet again, just days after Waymo responded to its initial broadening of the area.

Tesla launched its first expansion last week, less than a month after introducing Robotaxi rides in Austin.

The company opted for a very interesting shape for its geofence expansion, which was more of an indication that it could launch more rides in virtually any area of the city due to the new geofence it chose.

Waymo then responded to Tesla shortly after with an expansion of its own. After Tesla’s first expansion of its geofence, it had 42 square miles of Robotaxi-accessible travel region. This was larger than Waymo’s 37 square miles.

However, the Waymo expansion last week brought the company to a substantial 90 square miles of Austin:

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Waymo responds to Tesla’s Robotaxi expansion in Austin with bold statement

Tesla appears to be ready to respond. Drone operator and Gigafactory Texas observer Joe Tegtmeyer spotted Tesla Robotaxi validation vehicles well west of downtown Austin in the area of Marble Falls, Texas.

This would significantly increase Tesla’s square mileage if it could manage to bring its geofence to that size:

The two companies are not directly responding to one another with these expansions, but it appears that there is a significant amount of competition underway, which ultimately benefits the consumers.

Waymo has been operating in Texas since March from a fully public perspective, while Tesla is still slowly expanding its test size for the Robotaxi fleet on a nearly daily basis. Tesla launched Robotaxi rides to a handful of Early Access Program members on June 22.

Tesla is also expanding to other regions of the United States, particularly in Arizona and California. However, the Texas expansion is a priority currently, as it is the only region where Tesla has received approval to operate passenger rides in a driverless setting in the country.

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Elon Musk

Elon Musk confirms awesome new features at Tesla Diner Supercharger

More details continue to be revealed about the Tesla Supercharger Diner as its opening seems to be imminent.

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Credit: Brad Goldberg (via Sawyer Merritt on X)

Elon Musk has confirmed a few new features that will be present at the Tesla Diner Supercharger in Los Angeles.

Musk confirmed these two new details as he revealed he recently ate at the Supercharger Diner. We also recently confirmed a few menu items as a soft launch has already occurred, and a public launch date appears to be within reach.

The new features were revealed by Tesla Joy on X. We shared the details, and Musk confirmed that these are, in fact, features of the Diner that Tesla owners will be able to enjoy.

Tesla reveals key detail of Supercharger Diner, but it’s bigger than you think

The Diner is not exclusive to Tesla owners, but these two features do require a Tesla for compatibility purposes.

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Order Food from Your Car

As you pull into the Supercharger Diner, you can order any food item you want, including burgers, wings, fries, shakes, cookies, and more, directly from your vehicle.

A prompt will likely appear that will open a menu to the Supercharger Diner, allowing you to order food. An employee will bring the food out, that is, if Tesla decides to continue with a true and traditional 50s diner theme.

We get it, it’s not a groundbreaking feature. It’s still cool, convenient, and another advantage to visit the diner as a Tesla owner.

Movie Screen Audio Will Sync to Your Tesla

There are two massive movie screens that will play various entertainment options during your visit to the Supercharger Diner. There have been movie clips and even SpaceX launch highlights playing during recent drone flyovers at the location on Santa Monica Boulevard.

Instead of having to open your windows to hear the content on the screen, it will instead sync the audio and play directly in your vehicle through your car stereo speakers.

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The Supercharger Diner has also appeared on the Tesla app for the first time, and is currently showing 80 stalls at the location:

Although the stalls are not yet active, the culmination of all the details we’ve learned over the past week about the Diner only points to one thing: an imminent grand opening.

Tesla has not yet confirmed a date for the Supercharger Diner’s opening, and Los Angeles building and construction permits also do not state a specific target date for opening.

It seems as if Tesla will reveal the date itself, potentially in the coming week, as it will report earnings on Wednesday, July 23.

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