Hi, I have just driven home from work in an iX40 sport on 22” wheels. , raining hard, 8 degrees C and congested roads (30 miles took 80 minutes including 20 minutes at a temp light jam). Driving was mixed town and some motorway/A roads, but heavy traffic meant 50mph was rare.
i had climate on, normal (not eco) mode and all driving in B. Lights and wipers on, so essentially a lot of ancillary power use.
The efficiency improved over the journey and was 3.0 when I got home.
I did a 1000 mile road trip for a week in the lakr district 2 weeks ago with 10 to 14 degree temperatures, but the worst storms of the year on the trip there and back a few days later. I averaged 3.2 miles per kwh on that trip.
I notice the range predictor starts by looking optimistic, looking at a more than 1% fall in less than 2 miles covered, but then it evens out and by around 30% range left it matches the typical 3.1 to 3.2 mpkwh I have been averaging.
That is my experience, but there does seem a lot of variation. I don’t know whether the cars have different battery manufacturers or are all the same provider, which could explain a difference. It might just be driving style, but my experience has been consistent with minimal falls in efficiency as temperatures have fallen from the summer highs.
hope this helps?