2019 911 Speedster

1. Comparable market$565K

   19 of the same trim advertised at around 2,091 mi.

2. Mileage-6.6%$528K

   4,850 mi against 2,091 mi, the mileage the cars it is priced against carry. This cohort gives up 9.6% of its value each time the odometer doubles.

3. Specification+17.8%$622K

   This car has commissioned paint and 3 sought-after options. Comparable cars mostly do not. The paint is worth 17.8%, measured across 5 commissioned and 16 standard-paint cars of this generation and held toward the usual 12% while that sample is thin. 4 of the 19 cars it is priced against are commissioned too, so the step against them is smaller.

4. Modifications+0.2%$623K

   $5,000 of documented aftermarket work. The market pays for the car, not the invoice: the mark allows 20 cents on the dollar, capped at 15% of the mark.

19 cars, model years 2019, asking prices spread ±8%.

Struck from advertised cars and adjusted to this one. Indicative only.