Had another interesting EV experience. Went to the New Forest for a few days to visit the in-laws for Christmas.
We decided not to use the granny charger to to cost of electricity (and the fact that my father in law won't let us give him money for it).
Arrived with 68% left, not too shabby.
My wife went to Southampton on Boxing Day - no EV slots in the car park, so no top up. Set of back with 48% charge. Thus my prediction for return was 16% charge. The only difference is it was raining and at night . I spent a lot of the drive comparing Sat-nav mileage predication with the car's predicted mileage capacity. At one point the difference was down to 10 miles. A long 50mph section of roadworks helped getting it back up, and then some judicious driving at 60mph with the other slow traffic helped bring it back out to 30 miles differential. In the end, I got home with 10% charge left.
Not sure if it was a combination of rain / headlights making the difference, or if the car just seems to calculate electricity usage differently as you get towards empty.
On the plus side, for future visits there is now a Shell garage about 5 mins drive from the in-laws which has a set of 50kwh chargers (79p per kwh though) - so handy for a quick refill!