Just back from Donington and with four adults aboard - and a boot full of gear - I managed an excellent 6.1 mi/kWh over 17 miles of country lanes. Very happy with that.
Experiment update in the 500e:
So last night I did a 51 mph round trip, four up, in the dark, with A/C in, with the heating, wipers, radio and full beam on throughout. I was “making progress” as briskly as conditions would allow.
It also included 10 minutes of waiting with the ignition - and therefore A/C, heating, radio and wipers on - which carried on consuming energy. I drove the car with zero compromise, without regard for efficiency.
Even so, I covered 51 miles in 1h 43m at an average speed of 30 mph, consuming 4.1 mi/kWh and 62% of the battery in the process, reducing from a full (100%) charge to 38% with 28 miles remaining.
That means that the theoretical but real world range was 89 miles - but let’s say 80 miles as you ideally wouldn’t want to run all the way down to zero miles - compared to 115 WLTP Combined range.
I suspect that’s as close to the worst conditions for an EV. In Summer we split our time between North Devon and Notth Midlands. I could do the that journey with two stops, even in the conditions last night.
It takes 4-8 hours depending upon traffic, and so two stops for say 45 minutes is to be expected anyway - as I’m not a super human - and so I reckon the travel time would be very similar in ICE or EV.
That’s travelling in the shortest range option of the one of the shortest range models. A larger car with a larger battery and therefore longer range could only do better than that, ie the option of a one stop or non-stop.