As usual, it depends where you intend to drive it, but I get about 30 miles in the summer, and 22 ish in the winter.
i live i a fairly hilly area, and include some motor way use in that, which is not the best place to use up the battery really.
for me, if I’m working from home, and just using it locally for days at end, then you can get away with not starting the engine ever. I got close to 1000 miles out of a recent tank of 35litre petrol fuel up. During that time, it was probably costing me about 12p a mile, which is cheaper than using petrol at about 14p, but not loads cheaper.
If the weather is warm, you’ve got a tail wind, you turn the interior heating off, and start out with a warm battery whilst driving on a flat 40mph limit road, then yeah, I reckon you could muster 40 miles of range out of it. Maybe.
I’m happy with it, but it’s a company car, so makes sense to me, not sure the extra cost would pay itself back if it were a private choice, as the savings aren’t huge unless you’ve got mega cheap electric.