2013 Model S P85+
Took Delivery 6/23/2013
Mileage = 14,500 miles
Purchase Price = $115,220
Trade In Offer = $70,000
Taking off the Federal Tax Credit of $7,500 and the Louisiana Alternative Fuel Credit of $13,600 means my purchase price was $94,120. I believe you have to deduct those because if I tried to sell it directly to a third party those are credits they would get if they were to buy new (i.e., they would pay $94,120 after incentives for my car brand new from Tesla).
On top of that, Louisiana offsets the purchase price by the trade in value when computing sales tax. In my case that's 8.75% on $70,000 or $6,125. Therefore, to come out the same in a private party sale I would need to get $76,125 for the car.
I don't find these numbers that far off from my previous luxury vehicles that I have traded in after short periods of ownership.
Mike