I have a Nov/Dec 2017 Model S 75D with almost exactly 17,000 miles. I’ve noted that in the last 2,000 miles my 100% has dropped down to 242 miles from 253 (and 257 when new). This is more than 5% degradation. I’ve been keeping the batteries fairly well balanced due to needing to charge to 100% about once every month or two for longer road trips. I charge daily to about 80%, which has dropped from 203 down to 194. I know it’s winter now, but it seems like a big drop. Thoughts/reassurance? Am I nuts?