Where each one leads
Audi Q3
- New Audi Q3 cars registered in Europe in 2022 average 123 g/km of CO₂ on the WLTP test, against 129 for the Mercedes-Benz GLC in 2022.
- Measured by the cars' own fuel meters, the diesel Audi Q3 uses 6.7 l/100 km on the road, the Mercedes-Benz GLC 7.6.
- Measured by the cars' own fuel meters, the petrol Audi Q3 uses 8.2 l/100 km on the road, the Mercedes-Benz GLC 13.1.
- Measured by the cars' own fuel meters, the petrol hybrid Audi Q3 uses 7.8 l/100 km on the road, the Mercedes-Benz GLC 9.5.
Mercedes-Benz GLC
- Fewer Mercedes-Benz GLC cars in the Netherlands carry an illogical odometer record (2.4% against 2.7%).
Too close to call: MOT pass rate against cars of the same age; NHTSA overall safety rating.
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 Q3 | Mercedes-Benz GLC | |
|---|---|---|
| Model years in the US safety record | 2008–2026 | 2015–2023 |
| New cars registered in Europe | 837,215 (2011–2022) | 640,588 (2015–2022) |
| Licensed in the United Kingdom | 173,665 | 98,346 |
| On the road in the Netherlands | 31,753 | 25,833 |
| In traffic in Finland | 3,944 | 12,123 |
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 Q3 | Mercedes-Benz GLC | |
|---|---|---|
| UK MOT first-time pass rate | 84% | 88% |
| … against cars of the same age | +7% | +5% |
| New York safety inspections failed | 0.5% | — |
| … against cars of the same year | −48% | — |
| Illogical odometer records (NL) | 2.7% | 2.4% |
| US owner complaints | 242 | 24 |
| Most complaints about | Electrical system | Service brakes |
| Model year with most complaints | 2020 (66) | 2017 (13) |
| US recall campaigns | 19 | — |
| Manufacturer service bulletins | 6,488 | 273 |
| 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).
Safety
| Audi Q3 | Mercedes-Benz GLC | |
|---|---|---|
| NHTSA overall rating | 5★ (2025) | 5★ (2021) |
NHTSA New Car Assessment Program, most recent rated model year (public domain).
Fuel, emissions and price
| Audi Q3 | Mercedes-Benz GLC | |
|---|---|---|
| Official combined fuel use, Canada | 9.6 l/100 km (2026) | — |
| Real-world use in Europe, diesel | 6.7 l/100 km | 7.6 l/100 km |
| Real-world use in Europe, petrol | 8.2 l/100 km | 13.1 l/100 km |
| Real-world use in Europe, petrol hybrid | 7.8 l/100 km | 9.5 l/100 km |
| Real-world use in Europe, diesel hybrid | — | 6.6 l/100 km |
| Official CO₂ of new cars in Europe | 123 g/km | 129 g/km |
| Average power of new cars in Europe | 115 kW (154 hp) | 156 kW (209 hp) |
| Average mass in running order | 1,691 kg | 1,960 kg |
| Dutch list price when new (median) | €58,246 | €77,065 |
| Average odometer in Finland | 144,000 km | 123,000 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).