@jelloslug They are examples of consumption, but even this may not be enough. You are relying on the screen to be accurate, which it might not be.
Looking at how both Bjorn and Tesloop's packs behaved, they show remaining range then suddenly die. In effect the bottom X% of miles have "gone", so the screen still says 240 miles range at full but 10 miles actually = 0.
In Bjorn's case this happened at around 100k miles, but his lifetime average is crazily high due to all the towing he does. With your really low average Wh/mi (which would be impossible to hit here in colder climates), it should mean your car's pack is in good health.
The other factor may be supercharging, with both Bjorn and Tesloop doing so much more than a typical owner.
If we look at the actions put in play by Tesla, many seem aimed at kerbing high power draw and supercharger stress, with the OTA changes looking to limit those activities (chill mode, performance counters, supercharge capping). I wonder if this means the new chemistry is more sensitive to high currents than the old pack. So it's not necessarily mileage alone, but how those miles have been driven/charged.