I must have been lucky then .. .twice
For me it was a ski-trip - so winter-cold and, on one occasion, raining all the way, which was not good for range.
Admittedly haven't tried it at a holiday-weekend when everyone else is on the same route.
We've been going to the same place skiing, always driving, for decades, so I have a fairly objective ICE/EV comparison. ICE was 12 hours door-to-door. EV was an extra hour (3 x 20 minute stops). Two further stops - one for overnight on the way out (which we used to do with ICE too) and one on the way back for Lunch (yup, did that with ICE too
). Only difference was choosing a hotel that had Tesla Destination Charger (unexpected bonus got there to discover it had Michelin-star restaurant) and spent an hour over lunch, and careful to arrive at 10% so that we could leave at 95+%.
And a stop at the Tunnel to charge - time-neutral whilst we waiting for our train.
Arrived much more refreshed than back in ICE days when we stopped every 3 hours for 5 minutes to swap drivers and press-on. The 20 minute stop every 2-hours-ish made a huge difference to arrival freshness.
I've got an MS LR, so a bit more range than M3 and a bit more still than MY ... but I doubt it is more than 10% at best.
In case of interest an Alps-trip reports:
There were a number of public charge points in Morzine and Les Gets that you could get an overnight charge at but we were lucky enough to have a driveway/parking spot beside the chalet to run a cable out of the bathroom window to top up to 100%. The worst bit of the journey for us was making...
teslamotorsclub.com
And charging graph:
This is the return journey. Stop for an hour at 12 noon for lunch, and then at 17:00-ish at the Tunnel (waiting for our train anyway). That leaves the other 3 stops which were about 20 minutes each and 1h30m apart. The car would do 2h30m between stops (i.e. motorway range from, say, 80% to 10% at 130 KPH) but the Superchargers are not conveniently placed to allow that in practice.
Slope of the final leg shows that progress in UK traffic (and 70MPH) considerable slower / less "fuel" than France.