So as to not get into an extended argument with you, I will acknowledge that we are talking past each other and only respond to a couple points that have anything to do with what I was saying.
Each point was in direct response to something you said. If you think it wasn't then you didn't understand what I wrote. There is really no basis for argument here. There is basis for discussion. Whether you want to have a discussion on some of these points are not is up to you. Or you can, of course, choose to discuss only certain ones that interest you.
The Lexus most likely only shows an average MPG, and only from the time you last reset it. As such, assuming you reset when you fill up (because otherwise you probably never reset or only reset before long trips), the big departure tax ....
You said "...you seem to be acting like BEV is different than an ICEV, when in realty, they aren't." I pointed out that the basic theory is the same and it is. It doesn't matter what each vehicle displays or doesn't display (the Lexus is primative). The departure tax is still imposed. A large departure tax in a Lexus will manifest itself in poor mpg for the entire trip. It is energy/fuel that is used for a purpose other than moving the vehicle and therefore it degrades the AVERAGE miles attained from a unit of energy. Miles traveled divided by fuel/energy will be reduced if you idle an ICE vehicle, run the APU on an airplane, or idle the Tesla.
The problem with this theory is that, at least in my experience, the Wh/mi doesn't populate until you've driven at least .1 miles.
That is correct. Ostensibly the sampling interval is 0.1 mile and I say ostensibly because that is how often the trip data is updated and how often the energy display gets a new point. In fact, of couse, the necessary information could be going onto the CAN bus at a much higher rate and could be on a time basis but the finest resolution displayed to the driver is 0.1 mile.
what is displayed to the driver u In other words, you 've already departed and the cost of some acceleration (which is far more significant than what you were trying to measure) is already being included in the average. Now, it is possible that I am wrong about this
You are correct that the energy taken by acceleration will be added to the energy in the first tenth mile's bin. As will the energy used to cruise for the part of that first 10th after acceleration has ended. Coming out of my garage and going down the driveway (which is a tenth of a mile long so I typically get my first update whilst still in the drive) I'm probably going 20 mpH and according to the ABRP data should use about 33 Whr. That is equivalent to 1.1 minutes of the heater running at 1800 W. If you have run the heater at that level for less than a minute and depart your garage (or the parking lot of your hotel) reasonably then the traction energy required is going to be compartable to the departure tax. If, OTOH, you sit in your car for half an our basking in the warmth, playing the radio and planning trips clearly the departure tax is going to swamp the traction usage run up in that first 10th mile unless you go out of your driveway like A.J. Foyt in Ludicrous mode.
and I have never sat in my car for long enough to really add up some consumption, while also having sat there less than 15 minutes (which causes Car Off state and a reset) after hitting the brake (to enter the PRND state). It I also possible that you are referring to a meter other than the current trip meter, as I don't have those on my dash.
There are two trip "meters". One is labeled "Since hh:mm" and displays distance, time and Wh/mi. The second is labeled "Since Last Charge" and displays distance, kWhr and Whr/mi. The displays do not begin to update until you put the car in D and you have gone some distance which is less than 0.1 mile (so data is indeed apparently recorded at finer distance resolution). As soon as they update for the first time they display accumulated data since, respectively, the time you put the car in D and since you last charged it. The kWhr display jumps by the amount of the departure tax at the first update.
Those displays are, I believe, the key to understanding all this. Not that you can get kWhr from the since D totalizer simply by multiplying Whr/my by the inidicated miles. I still have some questions as to what the "since hh:mm" display is showing. I don't know when exactly it starts totalizing. I think it may be totalizing everything since the last tenth mile. It certainly seems to show the departure tax. While doing a short drive to see it read over 6000 Wh/mi at the first update. I certainly did not accumulate that kind of tax since pushing the pedal or going into drive but I really need to check on this more closely. I really wish there were a Tesla For Dummies book that explained all this. They are presenting the displays to drivers. They should tell drivers what they are displaying.
My point was and is that EVERY time you stop and start (stop signs, stop lights, etc), you are encountering the same "departure tax"
Absolutely right and my message in the first post was that one should try to keep the first departure tax to the level of the subsequent ones. But the advice to minimize stop and go driving still stands. I guess the broadest advice would be to not use battery for anything which does not involve moving the car in the desired direction of travel. Don't sit in the parking lot at McDonald's with the heater on is just as good advice as don't sit in your garage with the heater on.
I've already been over exactly how one could prove this out based on their real world experience (by resetting the car or a trip meter at any given stop).
You don't have to reset trip meters. The "Since hh:mm" display gives you Whr vs time. All you need to do is record that and you can stop and go as much as you want and reproduce the energy display with any boxcar length you like. This gives a pretty concise picture of how you are using energy over distance.
re-iterate, the departure tax you are referring to will ONLY show up on the consumption chart IF you get in the car and hit the brake to switch from "Car Off" to "PRND."
That doesn't appear to be the case but I do need to investigate more thoroughly. The consumption chart starts off with a big bang - at least it always does for me and the bang is bigger if I, for example, tell the car to warm up 10 minutes before I go out to it. I certainly didn't accelerate out of my driveway fast enough to consume kW in 0.1 mile. These high indications have to be departure tax because there is no other way to explain them.
To be completely redundant, in that scenario, the energy consumed in the period where they are sitting in the car, but not yet shifting into drive is effectively "phantom drain" for them.
That does not appear to be the case - not in my X anyway but I will be looking at this further with a mind to better understanding.