Very true. All our Teslas (two Xs and an S) degraded the most during our first year of ownership, about 4 to 5 percent. We are now down to one Tesla Model X100D. Five-and-a-half years in, battery degradation rate has remained “glacial”, staying at right around 10%. Brand new, our X100D was EPA rated at 295 miles at 100% charge. Today, at that same maximum charge level, we’re at 266 miles.
I still keep tabs on our previous Teslas, since we know the buyers/current owners. They’re reported that their cars too, are holding steady at 10% degradation, after six years.