Why would you charge with 80 miles of range (40% shown on that charger) left? It’s just going to charge slowly, you want the SoC to be as low as possible when you arrive at a rapid charger so it charges at a much faster rate.
Why would you choose to stop at a 50kW rapid when your car charges at upto 90kW?
Why would you charge above 80% SoC where charging speeds are massively throttled, 91% is way too slow?
And yes, 2.2 miles per kWh is typical of the eTron, it’s shockingly inefficient, you’d get around 3.1 from an e-2008 in those cold conditions, about 3.5 from a Tesla.
Using the M40, J11 has the multiple 150kW ultra rapid Instavolt chargers, why wouldn’t you stop there? Faster charging & no worries about all 8 chargers being busy. M6 J6 has two E.on 150kW chargers (Birmingham Armada).
Ecotricity chargers are unreliable & most EV drivers completely avoid them.
And you’d use ABRP or Power Cruise Control to plan the journey & charging, not Waze.
This video is about how to plan your EV journey badly.