Head to head · Sports
Porsche 911 vs Porsche 718 Cayman
On the measures that matter most to a used buyer — value retention, reliability, fuel economy and insurance — the Porsche 911 comes out ahead of the Porsche 718 Cayman, winning 2 of the 3 categories where the two differ.
| Measure | Porsche 911 | Porsche 718 Cayman |
|---|---|---|
| Est. value, ~3 years old | £70,450 (2023, 15,000 mi) | £39,300 (2023, 16,000 mi) |
| Value kept after 3 years | 70% | 70% |
| Reliability (MOT-derived, /100) | 93 · wins | 91 |
| Average mpg | 26 | 30 · wins |
| Insurance group | 33 · wins | 45 |
| 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 →
911 vs 718 Cayman — quick answers
Which is more reliable, the 911 or the 718 Cayman?
The Porsche 911 scores higher on Forecourt's MOT-derived reliability measure — 93 against the Porsche 718 Cayman's 91 out of 100.
How much does a used 911 cost compared with a 718 Cayman?
A roughly three-year-old Porsche 911 is worth about £70,450 at typical mileage, against about £39,300 for the equivalent Porsche 718 Cayman.