A regular round-trip I do several times a week incorporates a 5 mile section of M4 (J36-J37 – if you know it, you’ll know there are two big hills involved). The total round trip is 24 miles, including sections of road with 50, 40 and 30 limits.
Driving at 70MPH on the motorway (on electric), I can do the entire round trip and still arrive back home with an indicated 6 miles electric range.
So I make that a realistic range of 24+6 miles=30 miles which includes, as I say, 10 miles @ 70MPH on the M4.
When I jumped in the car this morning, after an overnight charge, it was indicating 42 miles electric range – that obviously was not achieved due to the motorway driving, but I have every confidence that if I were to pootle around at 25/30MPH, I’d get close to 40 miles range.
Oh, and the air con and radio were on the whole time 🙂