Head to head · Sports
Porsche 718 Cayman vs Mercedes-Benz AMG GT
On the measures that matter most to a used buyer — value retention, reliability, fuel economy and insurance — the Mercedes-Benz AMG GT comes out ahead of the Porsche 718 Cayman, winning 1 of the 1 categories where the two differ.
| Measure | Porsche 718 Cayman | Mercedes-Benz AMG GT |
|---|---|---|
| Est. value, ~3 years old | £39,300 (2023, 16,000 mi) | £91,900 (2023, 23,500 mi) |
| Value kept after 3 years | 70% | 70% |
| Reliability (MOT-derived, /100) | 91 | — |
| Average mpg | 30 | 30 |
| Insurance group | 45 | 33 · wins |
| Road tax / year | £200 | £200 |
| Typical annual service | £290 | £290 |
Valuations are each model's ~3-year-old example at typical mileage, through the same model behind the profiles. Adjust mileage, trim and condition in the interactive comparison →
718 Cayman vs AMG GT — quick answers
How much does a used 718 Cayman cost compared with a AMG GT?
A roughly three-year-old Porsche 718 Cayman is worth about £39,300 at typical mileage, against about £91,900 for the equivalent Mercedes-Benz AMG GT.