Where each one leads
BMW M4
- On Canada's official test the most frugal 2026 BMW M4 uses 12.6 l/100 km, the 2025 Porsche 911 Turbo S 14.4.
- New BMW M4 cars registered in Europe in 2022 average 229 g/km of CO₂ on the WLTP test, against 273 for the Porsche 911 Turbo S in 2022.
- Measured by the cars' own fuel meters, the petrol BMW M4 uses 13.2 l/100 km on the road, the Porsche 911 Turbo S 15.3.
Porsche 911 Turbo S
Ahead on none of the like-for-like measures.
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
| BMW M4 | Porsche 911 Turbo S | |
|---|---|---|
| Model years in the US safety record | 2014–2026 | 2005–2024 |
| New cars registered in Europe | 37,298 (2014–2022) | 15,184 (2010–2022) |
| Licensed in the United Kingdom | 20,019 | — |
| On the road in the Netherlands | 1,090 | — |
| In traffic in Finland | 138 | — |
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
| BMW M4 | Porsche 911 Turbo S | |
|---|---|---|
| UK MOT first-time pass rate | 87% | — |
| … against cars of the same age | +7% | — |
| New York safety inspections failed | 0.5% | — |
| … against cars of the same year | −58% | — |
| Illogical odometer records (NL) | 3.1% | — |
| US owner complaints | 47 | 3 |
| Most complaints about | Engine | Engine and engine cooling |
| Model year with most complaints | 2016 (22) | 2005 (3) |
| US recall campaigns | 13 | 5 |
| Manufacturer service bulletins | 1,022 | 1,240 |
| NHTSA defect investigations | — | 3 |
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
| BMW M4 | Porsche 911 Turbo S | |
|---|---|---|
| Official combined fuel use, Canada | 12.6 l/100 km (2026) | 14.4 l/100 km (2025) |
| Real-world use in Europe, petrol | 13.2 l/100 km | 15.3 l/100 km |
| Official CO₂ of new cars in Europe | 229 g/km | 273 g/km |
| Average power of new cars in Europe | 376 kW (504 hp) | 478 kW (641 hp) |
| Average mass in running order | 1,875 kg | 1,751 kg |
| Dutch list price when new (median) | €150,898 | — |
| Average odometer in Finland | 94,000 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).