Where each one leads
Mercedes-Benz SLS
Ahead on none of the like-for-like measures.
Porsche 911 Carrera
- On Canada's official test the most frugal 2026 Porsche 911 Carrera uses 11.3 l/100 km, the 2015 Mercedes-Benz SLS 15.6.
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
| Mercedes-Benz SLS | Porsche 911 Carrera | |
|---|---|---|
| Model years in the US safety record | 2011–2014 | 1997–2024 |
| New cars registered in Europe | 3,246 (2010–2021) | 18,394 (2010–2022) |
| Licensed in the United Kingdom | 205 | — |
| On the road in the Netherlands | 198 | — |
| In traffic in Finland | — | 252 |
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
| Mercedes-Benz SLS | Porsche 911 Carrera | |
|---|---|---|
| US owner complaints | 12 | 42 |
| Most complaints about | Air bags | Air bags |
| Model year with most complaints | 2011 (6) | 1999 (13) |
| US recall campaigns | 5 | 16 |
| Manufacturer service bulletins | 80 | 5,139 |
| NHTSA defect investigations | 4 | 1 |
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
| Mercedes-Benz SLS | Porsche 911 Carrera | |
|---|---|---|
| Official combined fuel use, Canada | 15.6 l/100 km (2015) | 11.3 l/100 km (2026) |
| Real-world use in Europe, petrol | — | 12.0 l/100 km |
| Official CO₂ of new cars in Europe | — | 237 g/km |
| Average power of new cars in Europe | 464 kW (622 hp) | 284 kW (381 hp) |
| Average mass in running order | 1,625 kg | 1,615 kg |
| Dutch list price when new (median) | €283,268 | — |
| Average odometer in Finland | — | 134,000 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).