2015 85D at 97,000 miles. Like OP, I plan on keeping the car at least 8 years, and potentially much longer if everything holds up. I've posted before but it bears repeating, for anyone planning on a similar ownership pattern, definitely consider the following once you are out of warranty:
1. MCU eMMC upgrade ($700-$800)
2. 12V upgrade (to LiFePO4 Ohmmu battery, $550 including installation)
My other stats:
-annual maintenance done at year 1, 2, and 4 (I was given the okay to bypass year 3 after OTA diagnostics by Tesla)
-instrument panel LCD replaced under warranty
-driver's door handle replaced with gen 3 door handle last month (out of pocket)
-steering wheel scroll wheel replaced (out of pocket)
-burned out HID headlamp bulb replaced (out of pocket)
-third set of Michelin Primacy tires (35000 miles on first set, 42000 miles on second set)
-lifetime avg 330 Wh/mi
Happy motoring!