BMW 3 Series vs Mercedes-Benz C-Class
2026 BMW 3 Series vs 2026 Mercedes-Benz C-Class: powertrains, fuel economy and running costs side by side. The most efficient BMW 3 Series version is rated 31 MPG combined, against 29 MPG for the best Mercedes-Benz C-Class.
| 2026 BMW 3 Series | 2026 Mercedes-Benz C-Class | |
|---|---|---|
| Versions rated | 4 | 3 |
| Class | Compact Cars | Compact Cars |
| Powertrains | 2.0 L 4-cyl turbo hybrid, 3.0 L 6-cyl turbo hybrid | 2.0 L 4-cyl turbo hybrid |
| Transmissions | Automatic (S8) | Automatic 9-spd |
| Drive | All-Wheel Drive, Rear-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Combined fuel economy | 29–31 MPG | 22–29 MPG |
| Best L/100 km | 7.6 | 8.1 |
| EV range (best) | — | — |
| Lowest CO2 (g/mi) | 286 | 307 |
| EPA annual fuel cost (from) | $2,650 | $2,850 |
EPA estimates for the U.S. market. The EPA annual fuel cost assumes 15,000 miles a year (45% highway, 55% city) at national average fuel prices. Use the comparison tool with your own distance and prices.