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My Tesla Model 3 and Winter data

4.7K views 15 replies 3 participants last post by  voldar  
#1 · (Edited)
March has come and the weather is no longer going to be harsher than it was in the last 4 months, so I decided to showcase how my Tesla M3 LR AWD did in the last four months (winter in Quebec). The data I post is starting with the 9th of November 2023, the day when I put my winter tires on, and it ends with today, the 5th of March 2024, when I still have the winter tires. It is mandatory to have winter tires from 1st of December to 15th of March in Quebec.

In the table below I used 77,5 kWh (based on the data I have) as the battery capacity for the calculation of the real Range (in miles and in km) that I would cover in the respective conditions. I considered 536 km the EPA range (333 miles). I used the information from Teslafi.
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What the data shows ? Compared to the experience of my 4.5 years ownership of Bolt EV (table below that I compiled over a winter in 2019) it shows that the heat pump does have an impact, I would say a big one in the temperatures around freezing (+5C to -5C). Even at temperatures below -10C it still has an impact, although it isn't that much.
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I would have to say though : my Tesla M3 HVAC system is a beast !
The setup I used when I was having my Bolt, was 20C - 21C at fan 1 or 2, to keep the consumption in check, especially during winter. In my Tesla M3 I used 21C Auto and I was literally sweating, so I start using 20C Auto in the last month. My wife complains that even 20C is too hot in the car when I am preconditioning the cabin before driving, being forced to set her side to 19C to get some cold air. What a great thing to have per user climate settings. I love it !

The efficiency during the 4 months of winter was 188,65 Wh/km.
I used 909.85 kWh charging my Tesla during this same exact period.
I covered 3766 km during this period (which is not much by any standards). I work from home and my daily driving is very short, less than 15 km roundtrip when I have to get out.
Having an "open ceiling" is a plus in cold weather with sun.

Notes :
  • preconditioning the car before going out has a big impact
  • use the Auto setting on your HVAC and you'll not have any problem with cold coming from the roof. Tesla has one of the best HVAC Auto setting that I experienced first hand over more than 10 cars I owned.
I simply love my Tesla ! My Bolt EV put a smile on my face every time I was driving it. The same does my Tesla.
 
#2 ·
I've got similar issues with my 2018's HVAC but in reverse: Set to 68F (20C) on Auto and most of the time all I feel is cold air. Outside air is between 37 - 45F (2 - 7C). The Auto HVAC really isn't all that good - not compared to other cars I own (Lexus, Subaru - both around 15 years old), but I have to keep the AC on otherwise I fog up quickly.
 
#3 ·
The Auto HVAC really isn't all that good - not compared to other cars I own (Lexus, Subaru - both around 15 years old), but I have to keep the AC on otherwise I fog up quickly.
In the Auto mode the AC is used as necessary. No need of you to intervene. Unless your 2018 was build different than my 2023. And the heat pump may have an impact too.
 
#4 · (Edited)
"Fun" fact : I pay 4.678¢/kWh when the temperatures are above -12C and 27.352¢/kWh when the temperatures are below -12C. Dual energy is indeed great ! This brings the cost of the energy used in my Tesla during the 4 months to $ 71.56.
If I have used my 2012 Ford Focus in the same conditions about 8.5 L/100 km, that would have cost me about 319,6 L of gasoline for driving the 3766 km. At a price of $ 1,58 per liter, this means the cost would have been $ 505.
 
#5 · (Edited)
Another "fun" fact : the difference between the worst efficiency and the best efficiency since I have the car and gather Data in teslafi : 35%
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Which is in line with the impact of cold weather on the EV's range. And Tesla is one of the EV that are impacted the lowest by the cold weather. One would argue that the lowest and the highest efficiencies aren't over a long distance travelled, but hey, that's the first year. We will see what's happening in the years to come.
 
#9 · (Edited)
And to put things in perspective :
My Bolt EV lifetime efficiency was : 240 Wh/km. When I sold it at 55 000 km, it was about the same as shown in the picture below.
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My Tesla EV lifetime efficiency is : 169 Wh/km.
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It is true that the efficiency in the Tesla is the efficiency when the car is driven. The efficiency of the Bolt includes also the efficiency when the car is idle. I don't have a ratio that can be used for comparing apples to apples, so considering that my Tesla used 15% more energy, this means the efficiency would be 195 Wh/km.
I am not a guy who's driving his car like an old man. I did drive my Bolt on the highway at speeds around 105-110 km/h (63-68 mph). I drive my Tesla on highways @ 120 km/h (75 mph) most of the time.
 
#10 · (Edited)
And today I changed my winter tires to the OEM. From the moment I put them on my car to the moment I changed them back, these are my efficiency numbers by temperature, as reported by Teslafi (from 9th of November to 15th of March):
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And these are the numbers in US metric :
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Yep, not much driving, mostly very short ones, but I am impressed with the efficiency nonetheless.
 
#11 ·
And today I changed my winter tires to the OEM. From the moment I put them on my car to the moment I changed them back, these are my efficiency numbers by temperature, as reported by Teslafi (from 9th of November to 15th of March):
View attachment 52998
And these are the numbers in US metric :
View attachment 52999
Yep, not much driving, mostly very short ones, but I am impressed with the efficiency nonetheless.
Those numbers closely agree with mine when < 40F. Where mine diverges from yours is >= 40F: I have never seen 250 Wh/mile at 40 - 45F. Still around 290. Note: After 5 1/2 years, lifetime efficiency is 291 Wh/mi at 79k miles.
 
#13 ·
Mine is garaged all the time as well, just not seeing the efficiency you are. Now, I don't know precisely where you're located, but here in the Seattle/Puget Sound area there is a lot of altitude changes - as I'm sure you well know, regen going down hills doesn't 100% compensate for going back up. I've also got stock-sized (but lighter) 19" wheels, so if you're running 18" then we start seeing where the differences are.
 
#14 ·
I’m in Montreal area and we do have some ups and downs but not more than a mild hill. When I had my Bolt, the energy recuperated by regenerative braking when driving down a slope was about 60-65% of the energy used to climb up. Tesla is about the same. I do have 18" wheels with aero, and yes, it can make a difference - from what I’ve seen, about 2-3% more efficient. But the tires that came with my Tesla when I bought it are Hankook Ventus S1 AS. I didn’t find much about them, but they are good and the efficiency was great. And perform great on wet roads. A bit noisy though on concrete. As winter tires I have Dunlop Winter Maxx 2 : great tires overall.
I am sure also that if my drives were longer, the efficiency would have been better.