255 wh/km, 13 % left from 90%, only got 185km out of it. 2 degrees in Vancouver, Canada but feels colder. I guess this is normal after reading some of the posts here
This doesn't compute.
255Wh/km*185km = 47.1kWh
(The 148Wh/rkm used here is an estimate, not sure of the exact value, but this is close.)
47.1kWh/(0.955*~148Wh/rkm) = 333rkm used. (rkm = rated kilometers)
The 0.955 factor accounts for the
displayed rated kilometers being 95.5% of the actual rated value in terms of energy content, due to the 4.5% buffer.
333rkm is 63% of 525 rated km. But you used ~77%, which for a new vehicle would be 404 rated kilometers. (100% is 525 rated km)
So it looks to me like you used about 77 rated kilometers, or 10.9kWh (77rkm*0.955*148Wh/rkm), while in Park.
For an actual long drive, where it mattered (for range - your number
does matter for efficiency),
255Wh/km would yield about 525rkm*0.955*148Wh/rkm / (255Wh/km) =
291km for a 100% charge, or 262km for a 90% charge, discharging to 0%. This result assumes a vehicle at maximum initial capacity of 77-78kWh, and assumes you don't attempt to drive into the ~3kWh buffer below 0% (don't do that).
Flipping this around, as per
@SSedan below, you actually got 0.955*77.5kWh*0.77/185km =
309Wh/km efficiency.
Not 255Wh/km as displayed in the vehicle. Again, assuming a vehicle at maximum capacity (you gave % so there's no way to tell).
So a minimum of about a 54Wh/km hit, mostly due to cold weather (preheating cabin, Sentry, etc.). The exact hit there due to cold weather depends on how long an interval between charges you were looking at. And a portion of that 255Wh/km is also due to cold weather. Both impacts will go down if you are driving further and faster and charging more frequently.