2004 911 GT3

1. Comparable market$160K

   7 of the same trim advertised at around 39,477 mi.

2. Mileage+7.1%$172K

   31,200 mi against 39,477 mi, the mileage the cars it is priced against carry. This cohort gives up 19.5% of its value each time the odometer doubles.

3. Specification+12.7%$194K

   This car has commissioned paint. Most comparable adverts list no options, so they are read as cars without them. The paint is priced at the usual 12.0%: this generation has fewer than three cars either side of the line to measure it on.

4. Condition and history+2.5%$198K

   no reported accidents, 3 owners, 11 service records. Comparable cars are assumed clean.

7 cars, model years 2000–2005, asking prices spread ±5%.

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