Fuel range calculation is different in the GRS PHEV?

[Nick72]

Filled up the tank earlier and it said range was 570 something miles. 

On the last 2021 PHEV it was rarely over 500.

Whilst I realise this is an estimation based off previous mpg my current mpg is 44 given only short trips and I've deliberately put the ICE on to get some miles on the car engine.

I am wondering here because on the 2021 the fuel range did not include the reserve and I've personally had another 80 or 90 miles AFTER range said zero and the orange light.

Is the GRS range including the reserve in that case?

Assuming the fuel tank is the same size.