I've got a late 2014 Model S 85 with AP and tech package, and just over 13,000 miles. Multi-coat red, tan leather, standard sound, coils, dual chargers, LTE upgrade. Not at all a stripper but not completely loaded I'm moving to from Southern Arizona (no snow) to Flagstaff in Northern AZ, which can get lots of snow. I drive PHX-Flagstaf a lot, and I-17 north of the Verde Valley is steep and can get snow. The hill into the Flagstaff subdivision is long and a bit steep in parts. I am considering selling my 85 and getting an 85D for better snow driving. I've read the various threads complaining about how bad the first year's depreciation is, but I have not seen a real figure for the average depreciation amount. What do people think is a good number to assume for first year depreciation as I determine my asking price for a private sale? 10%...15%...20%...?