As best as I can tell, the GOM is reporting back to the driver, from the journey being conducted from “boot up”.
This mileage etc is seen on the “current journey” trip recorder, which will automatically reset itself ready for that up and coming trip.
But as it does, it then compiles these figures and add’s it to the “Accumulated trip” total to give you a mean average, based over as many miles / trips as you have built up.
Taking into account a lot of different figures.
e.g. - I made a few school runs last week, I used the App to preheat the cabin before leaving and had the heater running for about 35 minutes outside the school while waiting.
The current journey trip had reset itself of course and the journey to the school is fairly short.
While waiting the M/KWh was something ridiculous low at crazy 1.8 M/Kwh’s !.
As it was displaying the huge consumption set against no data and basing its prediction on that very short journey, plus the heater eating electrons like they were going out of style !.
I had cleared out the historical data from the trips memory the night before, when I had the car on charge.
I do tend to regret bringing up this subject now, as I never intended for it to get into a big debate over what is right or wrong TBH.
Just to be clear, I am not conducting this exercise in an attempt to prove if resetting the trips is right or wrong folks !.
I am keeping a close eye on what is going on with my battery health after the issues surrounding our previous Gen 1 model.
After complying a lot of info and documenting it on our ZS EV Gen 1 over the two years and 20,000 miles we had the car, battery degradation was a real thing, without doubt.
I am therefore keeping a close eye on what is going on with the battery in our LR as I am sure you can understand.
Not resetting the trips is offering you a “best guess” ( and that’s is what it is ) at what it THINKS you are likely to achieve based on your historical data stored in the car.
This is totally fine when conducting regular daily trips, with a couple of known longer journeys when conditions are similarly matched by distance, weather and use of the heater / A/C.
If there are any changes to this criteria, then effects on the efficiency and GOM will only be slight as you have built up a lot of accumulated data stored within the car.
When both trips are reset, then the car is like a child at its first day at school, with a new exercise book and nothing written down yet.
A bit like learning on the fly, so to speak.
The car only has the information it is collecting from that single trip and could be regarded as a slightly more accurate prediction ( or guess ).
Yes the suggestion that by resetting trips offers the driver the best case figure WLTP figure from the pack on that day, is more accurate as it is learning on the fly.
It’s still a prediction of course, but for me it works because it is hopefully showing consistency ( or not as the case maybe ).
We have owned our car now for almost 10 months and covered 8,500 miles.
In that time I have decided to follow a routine that SHOULD continue to provide me with set of figures that I am use to receiving when charging to certain SOC points.
To date, the only deviation on these figures have been seen by the huge drops in ambient temperatures in the last few weeks.
I am plotting change in habits based on changing vs reported SOC levels from the battery.
So trip resetting has been an important part of this routine, it’s becomes easy to spot changes in the car’s behaviour when you use identical criteria’s.
The weather is the only fixture I am unable to control unfortunately ?.
But it clearly proved to me at least, that charging to a know consistent percentage battery level does not return the expected predicted range as seen when the ambient temperature is above freezing ?.
Without the figures I have kept, this would not have been possible to show.
Again - There is no right or wrong way here, only YOUR preferred way !.
@steve1973 has reached out asking other members what they are seeing as a predicted range when charging to the recommended 80% for daily trips in the LR models.
I have offered up my results and explained how and why I do this.
I have NO idea if what I am seeing on my car is correct of course.
Maybe another LR owner would be willing to reset both trip before charging and then set the charge limit to 80% and report back on what the car predicts as predicted range ?.