Every listing is scored 1–100 across four factors. Higher = better deal.
🏷️
Price vs. Market Average
0 – 45 pts
We compare the listing price against a benchmark average for each model (911, Cayman, Boxster). A car priced at the average earns ~25 pts. Every percent below average adds points — a car priced 30%+ below market can earn the full 45. Priced above market? Scores drop toward 0.
📍
Mileage for Age
0 – 30 pts
We calculate expected mileage based on the car's age (~12,000 mi/year). A car with half the expected miles scores near the maximum. A car with double the expected miles earns close to 0. Low-mileage examples are rewarded; high-mileage examples are penalised.
📅
Model Year
0 – 15 pts
Newer cars score higher, reflecting more modern safety, tech, and powertrain refinements. A 2024 model earns close to the full 15 pts; a 2004 model earns closer to 0.
🎯
Auction Badge Bonus
+5 or +10 pts
Auction listings can earn a bonus:
No Reserve +5 pts — the seller has committed to selling at any price, creating a genuine price-discovery opportunity.
Great Deal +10 pts — flagged as an exceptional value by our scoring algorithm.
Score labels
A note on auction cars — BaT, Cars & Bids, and PCarMarket listings show the current bid, not the final sale price. Early in an auction when bids are low, scores can look very high. Scores update every 2 hours and reflect the latest bid.
Benchmark averages — Price benchmarks are based on aggregated market data for each Porsche model and are periodically updated as the market shifts. They are a guide, not a guarantee.