Mercedes-Benz S 450 e vs Porsche Cayenne E-Hybrid: real-world fuel use
In real life the Mercedes-Benz S 450 e uses 4.2 L/100 km less fuel than the Porsche Cayenne E-Hybrid — about £876 a year at 15,000 km and £1.40/L.
214 cars in the data
Mercedes-Benz S 450 e9.5×the official figure
Official
0.7
Real world
6.2
0715 L/100 km
11,085 cars in the data
Porsche Cayenne E-Hybrid3.2×the official figure
Official
3.2
Real world
10.4
0715 L/100 km
| Mercedes-Benz S 450 e | Porsche Cayenne E-Hybrid | |
|---|---|---|
| Real fuel use (L/100 km) | 6.2 | 10.4 |
| Official fuel use (L/100 km) | 0.7 | 3.2 |
| Gap vs official | 9.5× | 3.2× |
| Distance with engine off | 31% | 21% |
| Real CO2 from fuel (g/km) | 144 | 240 |
| Official electric range (km) | 111 | 46 |
| Average kerb weight (kg) | 2,402 | 2,413 |
| Cars in the data | 214 | 11,085 |
Bold = better. Source: EEA OBFCM real-world data, reporting year 2024, CC BY 4.0.
Which one is cheaper to run?
On fuel alone, the Mercedes-Benz S 450 e comes out ahead for the average owner. Your own result depends mostly on how often you charge. Owners drive the Mercedes-Benz S 450 e 31% of the time with the engine off, and the Porsche Cayenne E-Hybrid 21%. Run the calculator with your own driving.