Lifetime average efficiency for my 2018 M3 AWD is 291 Wh/mile at 76k miles. Granted, I'm in the more rainy pacific northwest compared to upstate NY. Running 19 inch wheels 100% of the time with all-weather tires. During the week or so of cold weather we recently had (13F) I was seeing approximately 320 Wh/mile.

 

I don't have a MYP but a M3LR and the overall efficiency is 169 Wh/km / 272 Wh/mi Teslafi number - my car shows 168 Wh/km). I bought my Model 3 in June 2023. I have about 2000 km that aren't registered into my Teslafi, but here are the numbers as of today based on the outside temperature :

I do have 18" winter tires since the temperatures went below 10C. I made the conversion from km to miles in the graphic below.

My Tesla is a made in China one with a LGChem battery, not a Panasonic one that's in the Model Y Performance. This battery has about 2 kWh less than the Panasonic one.
My runs are short commutes (less than 5 miles) and I am sure the efficiency would be better (about 10% more efficient) if I would have driven 110 miles roundtrip.
In -15C temperatures, driving for 99 km roundtrip, speed on the highways @ 75 mph, my efficiency was 235 Wh/km = 378.2 W/mi = 2.64 mi/kWh.

Your Model Y Performace is not known for the efficiency though.
EPA kWh/100 miles for a Tesla M3 LR AWD : 26
EPA kWh/100 miles for a Tesla MY P : 30
This shows that the Model Y P is 13% less efficient than a Model 3 LR AWD.

So, If I make an average of my efficiency in the +5C to -15C temperatures I get 197 Wh/km = 317 Wh/mi. Thus, in a Model Y P, driving in my driving conditions, but in longer roundtrips (as you do) I would get an efficiency of 322 Wh/mi (317 Wh/mi -10% + 13%). I add 5% for 18” vs 19” and we have 338 Wh/mi. Which interesting enough, is close to your numbers.

What I don't get it, it's that you are saying that your lifetime efficiency is 341 Wh/mi. This means including warm temperatures. Which is strange to have such a low efficiency.

I am in Montreal, which is pretty close to what you have in upper NY.

 

Model Y Performance with Michelin Pilot Sport All Season 4 275/35R21 front and 295/35R21 rear

So far about 17kwH per 45 miles in winter or 2.64 mi/kWh
15kWh per 45 miles summer/fall or 3 mi/kWh
Average speed 64MPH

 

Thanks for all the input! good stuff! I'm thinking what primarily is hurting my efficiency is mostly highway miles?, 70mph with no ability to gain anything from Regen braking for 330 miles of my 400 roughly miles per week norm.

 

Are you setting departure time on the days you commute? That should help precondition the battery and increase range.
Look at the Energy Graphs, they give awesome information of where your power is going.

 

I will try that. Thanks!

 

My sister’s 2023 TMYP with 18K miles avg 291 Wh/mile.
My 2023 TMYLR with 6K miles avg 271 Wh/mi (19” w/caps)
Fathers 2020 TMYRWD with 16K miles 241 Wh/mi (19” w/caps)

My sister’s TMYP is garaged and typically most long trips start w/ battery and cabin preconditioned. Heat is set at 67F and speeds are typically 65-70mph. Tire pressures set at 41 psi on performance 21” rims. Car is used to drive kids to hockey all over northeast.

Biggest factors effecting efficiency are speed and use of heat. Lower both and your efficiency will improve. Start with a preconditioned/warmed battery and that will help as well.