When I charge the battery to 80% it says that I should have a 350 mile range but by the time I’ve driven 50 miles it’s down to about 260 instead of 300 and by the time I’ve driven another 50 it’s down to about 150 instead of 210, so the mileage available is significantly less than the mileage stated Which is supposed to be one of the big selling points of the car or other people having a similar experience and what can be done about it thank you.