I wonder did you recieve a update @Windy this winter or just before that saw miles drop, because I have am suspect of something here, it would be interesting to here if other stelantis group cars have had a massive drop after update coinciding with colder weather comming in or not.. because it could indicate low quality cells that they have done a update to reduce range so batteries last the warranty periods, because lets face facts if they batteries are poor quality and using them to a full capacity will mean they dont last 8 years its going to cost them millions in replacments.
you can see the deg went up hugely after the nov 2 update, its quite amazing really