Anyone with an EV quickly learns when going on a long-ish journey it makes sense to cut down on needless ascents if there’s a route you can take that may be slightly longer, but does not gave the overheads of climbing up one side of a hill. Sure, you can regen down the other, but this will never replace what you lost getting up there in the first place.
SatNav’s will calculate which is the shortest route between A and B, but do not look at the energy you will consume going up and over rather than skirting round the side or via an alternative lower altitude route. As a cyclist, I used to have a range of Bartholomew Maps, which were great as at a glance you could see whether your planned route was going to be hard work or not. If it was green, great - but if the colours changed to cream, brown or orange it was going to be a slog.
These maps are now available to all - UK EV drivers too - via the excellent National Library of Scotland Map Department. Bookmark the link below and used it next time you wonder what will be the optimum route for your journey.