This is the easiest question ever answered. At 28mpg you will save a fortune no matter what pence you pay per kilowatt. Lol
I’m driving the e3008 GT now and for range you’d be looking at 220 miles of a full charge bad weather and hopefully around 270 good weather.
You can charge at home so it should be a no brainer to switch and if in England even better as they have the best electric tariffs. And as you’ve already thought about I don’t imagine you’ll have range anxiety, which TBF is really only something a few would need to worry about.