I got this M3 SR+ 11 month ago. Initially the milage estimates where 339km @80%. More recently the estimates sit close to 295km@80%. I usually don't drive that long a distance but today after a full charge to 80% overnight I did 160km. That reduced the range estimate to 65km at the end. Assuming the remaining range estimate is as bad as the original, I actually had 45km left. So my actual driving range is 205km. My long term average consumption is 151w/km. I was doing 147w/km today. So how does Tesla estimates get this so wrong? And more importantly am I sitting on a dud battery pack?