The Tesla charging system works out the cheapest if you can plan around them. It can even work out cheaper if you have to go out of your way a bit to use one, as with membership you charge for around 30p per kwh compared with 75p/85p if you can do the whole journey using tesla it should cost you less than 10p per mile and that’s saying you only average 3 miles per kwh Don’t forget your first 200 miles will be charged at home so that part of your journey will cost 2.5p per mile. I’ve got an i4 and on long journeys with 4 people in the car with luggage doing 70 with heating/air con used as normal I average 3.8 miles per kwh. People get to obsessed with how much it costs to charge at rapid chargers saying it’s cheaper to have a diesel, but you need to take into account all the driving you do throughout the rest of the year charging at home at 7.5p per kwh which averages less than 2.5p per mile so yiu need to look at the costs overall. I’ve driven 7100 miles in less than 4 months because you don’t have to worry about fuel costs. Last week I drove just under 500 mile for less than £11.00. If like most of us you need to stop quite often due to disability then as long as you plan well you only stop as much as you would on long journeys anyway. Also every time I’ve used tesla chargers there’s always been chargers available and I’ve never had to wait. Enjoy you trip.
Just one thing to add,
Don’t travel on a Sunday! Everything in france is still closed on Sundays thank goodness
Happy travels