BMW X3 xDrive30e vs Mercedes-Benz C 300 de: real-world fuel use
In real life the Mercedes-Benz C 300 de uses 1.8 L/100 km less fuel than the BMW X3 xDrive30e — about £376 a year at 15,000 km and £1.40/L.
17,653 cars in the data
BMW X3 xDrive30e3.5×the official figure
Official
2.0
Real world
7.1
0510 L/100 km
6,926 cars in the data
Mercedes-Benz C 300 de5.8×the official figure
Official
0.9
Real world
5.3
0510 L/100 km
| BMW X3 xDrive30e | Mercedes-Benz C 300 de | |
|---|---|---|
| Real fuel use (L/100 km) | 7.1 | 5.3 |
| Official fuel use (L/100 km) | 2.0 | 0.9 |
| Gap vs official | 3.5× | 5.8× |
| Distance with engine off | 24% | 19% |
| Real CO2 from fuel (g/km) | 165 | 141 |
| Official electric range (km) | 48 | 78 |
| Average kerb weight (kg) | 2,065 | 2,046 |
| Cars in the data | 17,653 | 6,926 |
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 C 300 de comes out ahead for the average owner. Your own result depends mostly on how often you charge. Owners drive the BMW X3 xDrive30e 24% of the time with the engine off, and the Mercedes-Benz C 300 de 19%. Run the calculator with your own driving.