No, it was not plugged in. You can't really see this if you keep car plugged in because the stats reset after exact charging.
You can toggle between, "last charge" and "last drive".
Btw, the preconditioning is separate category, you can see that in the screenshot I uploaded. Also, if you turn off the preconditioning, the range when you start driving is horrible, and the car stays in reduced regen breaking for quite long (yesterday it took ~45 minutes of driving before regen breaking started to work, because it is -20C here and at the Tesla shop they left car on the lot with preconditioning turned off. By the time I got home, the estimated total range onthe car (charged at ~90% at Tesla center that morning) was ~200 miles. Even if the temp outside is around zero C, the regen limit kicks in if car sits on the parking lot for a while.
There's a new setting for blending brakes, so that if it's cold and there's no regen available, you won't notice a difference in braking performance, since the car will blend in mechanical braking. The range will be "horrible", with no preconditioning, because there will be heating losses as you start to drive. If I don't precondition and if I don't use the HVAC, just use seat and steering wheel heat, then range is good.
This is quite disappointing. I did ask a colleague with a bit older M3 and he has no problem like that. Tesla tech claims it is all good and normal...
Someone on the spot can discover and diagnose an issue far easier than random folks on the internet. Have you considered asking your colleague to sit in your car and look over your screen displays and settings to see if he has any thoughts. To be fair, english is my 2nd language, and it's also yours, so this problem has not been easy to understand.
My flight got cancelled on Friday and I got back home. I left the car alone for ~24 hours and when I reactivated the app and got in the car, the charge dropped ~10%, so no driving whatsoever. Most of it was spent on the stand by, little bit on the app, and some on the preconditionning because I forgot to turn off the 8-am drive prep.
Someone else mentioned that Preconditioning could be the issue. And, the one time I used Preconditioning, it used 1%, but Mobile App was 5% and Standby was 4%. Mobile usage was far higher, and Standby usage was a little higher than my norm when not using Preconditioning. The idea is that the breakdown between the categories may be wrong since the software is new, it may mostly be due to Preconditioning. That is, buggy software. Total consumption may be right, but the category breakdown may be wrong.
Then I left it another day, but with one major difference - the outside temperature where I live jumped up significantly: today it was ~+10C most of the the day, while the night I left it was ~-20C, but the car was in the garage, so probably ~-5 or little bit lower). The state of charge actually went up ~2% (from 90% to 92%), over the entire day, and no stand by expenditure reported. Also, the car was quiet, like it is dead, it started humming when I turned on the tesla app.
So, it seems that this "stand by" drain is indeed comming from car trying to keep the battery within some temperature range, and not that much from some other app, or the tesla app waking it up frequently. And it must be pretty tight, as I've seen the drains as 8-10% per night with temperatures around -5C.
It's possible, but we've noticed that when the ambient temps change from one day to the next, a SOC change is possible. I notice this when the temp increases. So, if the car says 60% when I park, and then the next day it's a lot warmer, it might say 63%.
Here's a different example. When I got in the car, it was cold. I drove 27 miles to my doctor's appt, and then 27 miles back. When I was stopped, the car's pack warmed up in the sunny daytime, and the SOC increased about 2%. You can see it in the data. I started at 59%, ended at 45%, a diff of 14%, but I used 15.9%. There's the 2% gap due to the pack warming while I was stopped.
Presumably, the same must happen when it gets colder. Generally, when you park, it's late in the afternoon, the day has warmed up, so the pack sees warmer ambient temps when it's calculating the SOC. Overnight, it's getting colder, so that by morning the pack is cold, electrons are moving slower. The pack may be measuring lower SOC, just due to the ambient change. And the BMS has to attribute this change somewhere. The most likely category would be Standby.
Now that I think in revese, I am almost certain that this all started being noticeable after one of the Tesla's updates, back in October I think, where one of the items was some "cold weather battery charging improvement" or something like that. I wonder if Tesla tightened the temperature range that the battery has to be held at, for some reason, increased the minimal temperature it can sit at, perhaps to avoid premature aging and capacity loss, or, whatever other reason could be. This is far fetched, of course, and I could be wrong. I just don't know why would they be so shady about it, blaming other apps, sentry mode, me checking app million times a day, and so on.
I'll keep an eye on it as we have more fairly warm days ahead, and then temperature will drop again.
It's possible. Certainly whenever I've checked SMT, 4x so far this winter. Usually it's ~20F outside, and my battery pack is about ~40F. So, the pack is warmer than the ambient. That has to use some energy, and the question is what category is it being counted against? And, my belief is that it counts against Standby.
Here's Christmas day, I'm about to go out: It's cold, 23F, and it shows a blue snowflake, my normal SOC shows 58%. The car has used 5.7% under Standby, and a little on the MobileApp, 0.5%.
Here's what SMT shows. Outside temp is 22.1F. Battery pack cells show 38.7F. And, the rear motor is showing 51F.
So, it's cold outside, but the pack shows it's about 17F warmer than the outdoor ambient. Some energy is being used to keep the pack at some minimal temp, and the usage seems to be Standby.