so you charge at home in the midlands ( I also get 6.7kw from my home charger) and 50kw in london? Is the difference a one off or every time? I still think it is likely a diff in the efficiency achieved in the trips before the charge. so if locally you are mainly doing town stop start driving and then do a london trip with a better efficiency and then charge the suggested km from the state of charge will be affected.
So lets say in the midlands you av 22.5 kwh/100km a 100% charge would show a range of 355km (80 div 22.5 = 3.55 x100 = 355). If before the london charge the trip meter shows say 20.5kwh/100km then 100% would be 390km. Sorry for using km but it is how my car is set up but it shows the thinking….temperatures also affect efficiency so say a journey in the early morning where it is say 10deg C v the same journey in the afternoon at 25deg c may give a different efficiency but generally I think it is the much colder temps that causes losses though high do as well. But the midlands is not that far from london🤣
I went on a 32km trip today and achieved 19.2kwh/100km. The return was 22.9kwh the difference being it is more uphill coming back. The av between the 2 is 21.2kwh/100km. The car has 32% SOC and a stated range of 121km. Theoretically 100% charge is 80kw so each kw is .8. At 32% SOC the battery has 25.6 kwh (.8x32). 25.6 div by 21.2 (kw divided by the last average trip efficiency reading) = 1.2075 so rounded up 121km range. If I go back on my outward journey at 19.2kwh the range would be 133km.
To achieve the advertised range of 414km given under the WLTP regs I need to achieve a kwh/100km figure of 19.32kwh/100km ( 80kw divided by 414 x 100) and I have seen figures near that and lower so the car does have the ability if the driving conditions (traffic, terrain, and weather) allow.
I strongly suspect thinking this through it is all done to the consumption at the start of the charge that is altering the range not how quickly the power goes in, the car is either charged or not and 80kw battery cannot have 90kw squashed into it as far as I am aware🤔 would be very pleased to get others views on my thinking.