VW in my case. Had a succession of Blue Motion Golfs, 'coz we are committed Eco-ists. And then discovered I'd been shafted by DieselGate, looked around for something Eco and at that time (2015) had no idea that Tesla existed. Springing from a Blue Motion Golf for a pushing-£100k car made us gulp ... and whilst I was waiting Tesla discontinued the 85 and offered me to 90 (and pony up quite a bit more) or drop back to 75 (with refund). I was doing 30K miles a year at that time, and (with hindsight) very glad that I bought the longer-range. As soon as the gulp-cost was forgotten having out-of-range trips twice a month was made much better by often only needing a splash-and-dash. That was 240 mile realistic range, now on an MS Raven and 300 mile range, that twice-a-month charge has become a couple of times a year as more of the out-and-back business journeys are "within range"
Anyway, thanks VW ... and "Bye" 'coz wife and I are never buying anything from your stable, ever again. But your ID range looks more competent than the others, so I wish Herbert Diess well - if he doesn't get ousted by his dinosaur peer directors who want business-as-usual.
You need an APP that predicts the catastrophic drop in 2nd price when all the laggards, behind you, suddenly wake up and smell the cocoa!
We used to do that going skiing in the Alps in Fossil. Every couple of hours just swap-drivers-and-carry-on. Very occasionally stop for a pee. Stop for lunch in the middle of the day.
Result? We arrived knackered.
Now when we drive to Alps we plan the lunch stop so that we arrive on single-digit-electrons, fill the battery full, and have at least a half-decent lunch. We're on holiday for cricks sake! we don't need to only stop for 5 minutes for a sandwich tired and curled up at the edges (and probably the same price as a restaurant lunch) An hour for lunch gets the car from empty-to-completely-full
Then a 20 minute stop every 2 hours-ish (depends how ideally spaced the Superchargers are; the car will pretty much do 2h30m at 130 KPH from 80% down to 10%, but in practice some legs are only 1h30m because no suitably placed Supercharger (yet ... its way better than it was when we first did it a few years ago)
I think of Alps as "12 hours door-to-door". EV has added 3 x 20-min recharge stops (in addition to Lunch), which has replaced 3 x 5 minute driver-swap. So added about one hour to the 12-hours.
Result? arrive fully refreshed. The walk from car to the services, stretch our legs for 20 minutes, stand upright, get a coffee etc. actually seems to make a big difference. Or it might be just that I feel Smug. Don't care, either way, it works for me
For anyone with Kids / Dogs these stops won't add any extra time. For passengers it may be a bit more of a drag (journey got longer), but them getting out and stretching their legs means they will arrive in better shape too.
Darts Farm, near Exeter (if your Devon trip takes you that way) has a fab shop. But its a popular stop, so stalls may be busy.
Granny Charger will give you 7 MPH (maybe more if your tootling around is at low speed), so 14 hours charging each day would get you back 100 miles, or more.
Maybe have a look for Restaurants (or Hotels) with Tesla Destination chargers? (e.g. using PlugShare where you can also see the Comments to see if someone has actually successfully charged there recently). Anything from 7kW upwards, so you'll get 25 - 50 MPH from them. More limiting on choice of restaurants ... but you may find something you wouldn't otherwise have chosen. As we were driving along on a recent trip Wifee selected just such a place for lunch. When we got there it looked like the Kremlin, definitely would have normally just driven on past it ... but a uniformed footman directed us to the Tesla Destination Chargers and the Pud was the best I have ever eaten, without exception.