Where each one leads
Audi TT
- New Audi TT cars registered in Europe in 2022 average 161 g/km of CO₂ on the WLTP test, against 192 for the Porsche Cayman in 2022.
Porsche Cayman
- Against cars of the same age, the Porsche Cayman comes out better at its first MOT test (passes 27% more often than average) than the Audi TT (passes 13% more often than average).
- Against cars of the same year, the Porsche Cayman comes out better in New York safety inspections (fails 82% less often than average) than the Audi TT (fails 24% less often than average).
- Fewer Porsche Cayman cars in the Netherlands carry an illogical odometer record (6.1% against 10.0%).
Too close to call: official combined fuel use, Canada (l/100 km).
Only measures that do not depend on how many cars were sold: pass and failure rates against cars of the same age, ratings, fuel use and CO₂. How we compare
At a glance
| Audi TT | Porsche Cayman | |
|---|---|---|
| Model years in the US safety record | 1999–2024 | 2005–2020 |
| New cars registered in Europe | 78,602 (2010–2022) | 4,921 (2010–2022) |
| Licensed in the United Kingdom | 60,772 | 8,584 |
| On the road in the Netherlands | 8,176 | 815 |
| In traffic in Finland | 1,718 | — |
EEA new-car registrations (CC BY 4.0) · DVLA licensed vehicles (OGL v3.0) · RDW (CC0) · Traficom (CC BY 4.0) · generations: Wikidata (CC0).
Reliability and problems
| Audi TT | Porsche Cayman | |
|---|---|---|
| UK MOT first-time pass rate | 76% | 89% |
| … against cars of the same age | +13% | +27% |
| New York safety inspections failed | 1.6% | 0.4% |
| … against cars of the same year | −24% | −82% |
| Illogical odometer records (NL) | 10.0% | 6.1% |
| US owner complaints | 319 | 29 |
| Most complaints about | Electrical system | Power train |
| Model year with most complaints | 2001 (120) | 2014 (7) |
| US recall campaigns | 12 | 5 |
| Manufacturer service bulletins | 7,556 | 2,688 |
| NHTSA defect investigations | 2 | — |
Complaint, recall and bulletin counts grow with the number of cars sold and are not adjusted for it. UK MOT: DVSA anonymised MOT results (OGL v3.0); New York: DMV inspections; complaints, recalls, bulletins and investigations: NHTSA (public domain); odometer: RDW (CC0).
Fuel, emissions and price
| Audi TT | Porsche Cayman | |
|---|---|---|
| Official combined fuel use, Canada | 9.4 l/100 km (2023) | 9.4 l/100 km (2019) |
| Real-world use in Europe, petrol | 8.4 l/100 km | — |
| Official CO₂ of new cars in Europe | 161 g/km | 192 g/km |
| Average power of new cars in Europe | 159 kW (213 hp) | 213 kW (285 hp) |
| Average mass in running order | 1,385 kg | 1,434 kg |
| Dutch list price when new (median) | €52,209 | €95,210 |
| Average odometer in Finland | 219,000 km | — |
Canada: NRCan Fuel Consumption Ratings, most frugal version of the latest year (OGL Canada). Europe: EEA monitoring of new-car CO₂ and on-board fuel meters (OBFCM), CC BY 4.0. Price: RDW catalogue price (CC0). Finland: Traficom (CC BY 4.0).