2025 Porsche Panamera vs 2026 Mercedes-Benz S580 4matic
| EPA figure | 2025 Porsche Panamera | 2026 Mercedes-Benz S580 4matic |
|---|---|---|
| Model year | 2025 | 2026 |
| Body · drive | Large · Rear-Wheel Drive · Gas | Large · All-Wheel Drive · Hybrid |
| Combined MPG | 21 | 20 |
| City / highway MPG | 18 / 25 | 17 / 27 |
| Fuel a year | $3,900 | $4,100 |
| Tailpipe CO₂ (g/mi) | 431 | 438 |
| Engine | 2.9 L 6-cyl turbo | 4.0 L 8-cyl turbo |
| Transmission | Automatic (AM-S8) | Automatic 9-spd |
▲ marks the better official figure on that line: more range, MPG or MPGe; less fuel cost or CO₂. From fueleconomy.gov.