Where each one leads
Audi S4
- On Canada's official test the most frugal 2025 Audi S4 uses 9.7 l/100 km, the 2026 Mercedes-Benz AMG GT 10.8.
- New Audi S4 cars registered in Europe in 2022 average 192 g/km of CO₂ on the WLTP test, against 239 for the Mercedes-Benz AMG GT in 2022.
Mercedes-Benz AMG GT
- Against cars of the same year, the Mercedes-Benz AMG GT comes out better in New York safety inspections (fails 59% less often than average) than the Audi S4 (fails 34% less often than average).
- Fewer Mercedes-Benz AMG GT cars in the Netherlands carry an illogical odometer record (4.5% against 19.8%).
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 S4 | Mercedes-Benz AMG GT | |
|---|---|---|
| Model years in the US safety record | 1989–2025 | 2016–2021 |
| New cars registered in Europe | 19,281 (2010–2022) | 23,020 (2014–2022) |
| Licensed in the United Kingdom | 9,108 | 183 |
| On the road in the Netherlands | 1,075 | 1,052 |
| In traffic in Finland | 227 | — |
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 S4 | Mercedes-Benz AMG GT | |
|---|---|---|
| UK MOT first-time pass rate | 84% | — |
| … against cars of the same age | +15% | — |
| New York safety inspections failed | 1.3% | 0.4% |
| … against cars of the same year | −34% | −59% |
| Illogical odometer records (NL) | 19.8% | 4.5% |
| US owner complaints | 589 | 18 |
| Most complaints about | Electrical system | Power train |
| Model year with most complaints | 2000 (143) | 2016 (6) |
| US recall campaigns | 16 | 12 |
| Manufacturer service bulletins | 11,028 | 337 |
| NHTSA defect investigations | 4 | 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).
Safety
| Audi S4 | Mercedes-Benz AMG GT | |
|---|---|---|
| NHTSA overall rating | 5★ (2016) | — |
NHTSA New Car Assessment Program, most recent rated model year (public domain).
Fuel, emissions and price
| Audi S4 | Mercedes-Benz AMG GT | |
|---|---|---|
| Official combined fuel use, Canada | 9.7 l/100 km (2025) | 10.8 l/100 km (2026) |
| Real-world use in Europe, diesel hybrid | 8.2 l/100 km | — |
| Real-world use in Europe, petrol hybrid | — | 12.8 l/100 km |
| Real-world use in Europe, petrol | — | 16.5 l/100 km |
| Official CO₂ of new cars in Europe | 192 g/km | 239 g/km |
| Average power of new cars in Europe | 251 kW (337 hp) | 385 kW (517 hp) |
| Average mass in running order | 1,907 kg | 1,993 kg |
| Dutch list price when new (median) | €89,662 | €247,441 |
| Average odometer in Finland | 212,000 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).