I was given a 2015 90D as a loaner today with 61,782 miles. It was charged to 73%. Stopped at a SC on the way home to go to 90%. It charged to 238 miles at 90% (which should be 264 miles at 100%). If the true rated range of this pack was 288 miles that puts the degradation at 8.3% That seems pretty good after 4 years.