And one last thing. My Tesla Model Y is Fremont built with NCA battery (vs NMC battery I had on my Tesla Model 3) that I drive mostly short runs, I charge it to 55% daily only. When I go in longer trips I charge it to 100% to allow the BMS to balance its numbers. I did charge it two times to 100% in the two months of ownership.
Teslafi shows today this :

 

And now at 3 months ownership, the battery

And if I compute the values based on the Energy screen :

155 x 245 / 0,49 = 77,5 kWh

The drive above in Teslafi

 

And now after 4 months of ownership :

Scan My Tesla shows the same steady 77.7 kWh battery capacity

And if I compute from Energy screen :
185 x 231 / 0.55 = 77,700 Wh

And with the cold weather coming, I am pretty impressed of its efficiency. And I wasn't shy while driving it on the highway.

 

Wow thanks for sharing. So much math and statistics.

FWIW, the M3H RWD with 19" Nova avg 118wh/km per the computer since I got it on end June. Mix of city & hwy. My wife that drives it half the time treat it like an ICE vehicle. A/C and seat ventilation cooling on in the summer. Although she does drive in Chill mode.

 

Great efficiency on the 2024 Model 3 RWD Highland ! Unfortunately for me, the Model 3 ingress/egress and the lack of towing capacity were the two things that drove me towards a Model Y AWD. And the new suspension on the Model Y !

My daily usage is really very short and I am not really driving for efficiency (Normal mode and 21C Auto HVAC all year long). The above information is related to my Model Y AWD. After a year of ownership of a Tesla Model 3 AWD I had an efficiency of 166 Wh/km, this including the winter 2024. Which was pretty good, considering that my efficiency over 4.5 years of my Bolt EV ownership was 240 Wh/km. It is true though, I drove 5 winters in these 4.5 years of ownership and during covid times I drove less than 8 000 km/year and mostly during winter.

P.S. One thing you should absolutely do on your Model 3 : replace the mudflaps that came on your Tesla with one of these ones. For whatever reasons, Tesla decided to put crappy mudflaps on the Model 3 vs the ones on Model Y.

Model Y :

Model 3 :

 

Tesla did come with their stock mudguards which I didn't install. Instead replaced it with something more streamlined. I think it should suffice. Since it's RWD, the fronts shouldn't be kicking up a storm. <shrug>

I am sure winter season will degrade the Highland's efficiency. Bjorn Nyland achieved 99wh/km or something crazy with the M3H.

 

Today, 5th month :
Scan My Tesla : 77.5 kWh

Using the computation based on Energy app :
175 x 240 / 0,54 = 77.8 kWh

 

Today 18 Dec 2024 - 6 months

Using the computation based on Energy app :
170 x 248 / 0,54 = 78.07 kWh

 

Today January 17, 20205 - 7th month :

Based on the Energy app :
192.4 x 221 / 0.55 = 77.3 kWh

 

Today February - 8th month

 

March 20th - Nominal full pack = 76.9 kWh

 

May 2nd - Nominal pack = 77.4 kWh

Interesting enough, it looks like the BMS reads higher capacity now, in May vs March. I am not sure why, I charge my Tesla to 55%, didn't charge it to 100% in the last 6 to 7 months. This means the battery temperature does have an impact on the BMS readings.

Teslafi today is showing a 0.51% loss over almost 11 months of ownership.

77.8 / 77.4 = 0.52 % loss. Could be the decimals, so I can consider Teslafi as very accurate.
P.S. The numbers are in KM not MILES.

 

Could you take a shot of the current energy page numbers as well, like you did the first few months of this thread. Thanks.

 

15th of May data, almost 11 months of ownership
- Scan my Tesla : 77.2 kWh capacity

Energy app :

158.8 x 267 / 0,55 = 77,09 kWh

171.8 x 247 / 0,55 = 77.15 kWh

157.5 x 269 / 0.55 = 77,03 kWh

 

So, what does all these mean ? Well, it means that anyone can get an idea of their battery degradation by only using the Energy app screen, no need to do the whole Battery degradation cycle that's now available in the UI. Although the Scan my Tesla app shows 78.8 kWh battery capacity (full capacity when new), I never saw this number, I could only see 78 kWh two days after getting my car. Also, it looks like the best reading is the one taken at the 15 km (10 miles in the US Tesla).
Based on these numbers, I can say that the degradation of my Tesla battery is (1 - 77.2 / 78) = 1% after 11 months of ownership and 8,005 miles (12,883 km).
Given the fact that the EPA number for my Tesla was 496 km, if we subtract 1% this means I should see 491 km at full.
Right now I see 270 km @ 55% which equals to 490,9 km, which is in line with the above.

Teslafi is showing an EPA number of 492 km based on the BMS readings.

 

Today SMT (ScanMyTesla)

290 x 144.8 / 0.55 = 76,349 Wh = 76.4 kWh

281 x 149.2 / 0.55 = 76,227 Wh =76.2 kWh

277 x 151.6 / 0.55 = 76,351 Wh = 76.4 kWh

 

Yesterday readings :

170.1 x 244 / 55 = 75,462
135 x 307 / 55 = 75,354
162.2 x 256 / 55 = 75,636

 

Today :

Big cell imbalance, last week I left the car outside unplugged during the day.

149.5×262÷0.52=75,382.69 Wh = 75,4 kWh
148.8×263÷0.52=75,259.23 Wh = 75,3 kWh
163.1×240÷0.52=75,277.69 Wh = 75,3 kWh