Major discrepancy with real numbers

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Your plans used to be fairly accurate, but I found them completely off recently.
With Kia eniro 65kwh
200 km total distance
starting at 80%
@ 115km/H
On Arrival there is 22% remaining…
Measured average in vehicle just below 200
The big problem is that the app advices me to stop much more than required. And instead of arriving at 10% i arrive with 25% or more. A margin is nice, but having all these extra stops makes the app useless !

There is a major calculation error
I have to set the ref consumption to 150 (real about 200) and 0 degradation (real est 2%) and temp at 20 (real around 0) and 0 extra wheight (real about 150) , etc

The range given in the car at 100% is never below 300km
Usually about 350 -380 @ 120km/h…
So 67% is atleast 200.
So even conservatively starting from 80% anything less than 13% remaining after 200 km would require a top box, -24 @120km/h and 300 kg extra and snow.
I don't see the value of the application if it doesn't feedback to real numbers or has very accurate simulation.
This is pretty useless.
Also it doesn't assist in giving stopover alternatives. I really want to select optional stops to get amenities, it doesn't advice or replan when a station is busy.