Mercedes-Benz GLB-Class vs Rolls-Royce Cullinan
The Mercedes-Benz GLB-Class is the more efficient of the two: it reaches 28 mpg combined versus 14 mpg for the Rolls-Royce Cullinan, a 14 mpg advantage and costs about $2,750 less per year to fuel.
Across 5 measured categories, the Mercedes-Benz GLB-Class leads in 5. Figures are EPA test data, not manufacturer claims.
2020–2026
Mercedes-Benz GLB-Class
Small Sport Utility Vehicle 4WD · 20 configurations
2019–2027
Rolls-Royce Cullinan
Midsize Station Wagons · 17 configurations
Head-to-head specifications
| Metric | Mercedes-Benz GLB-Class | Rolls-Royce Cullinan |
|---|---|---|
| Best combined MPG | 28 mpg ✓ | 14 mpg |
| Best city MPG | 25 mpg ✓ | 12 mpg |
| Best highway MPG | 33 mpg ✓ | 20 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,700 ✓ | $5,450 |
| Lowest CO2 output | 311 g/mi ✓ | 609 g/mi |
| Engines offered | SIDI; Mild Hybrid, SIDI | SIDI |
| Transmissions | Automatic (AM8) | Automatic (S8) |
| Drivetrains | Front-Wheel Drive, All-Wheel Drive, 4-Wheel Drive | All-Wheel Drive |
| Fuel types | Premium | Premium |
| EPA class | Small Sport Utility Vehicle 4WD | Midsize Station Wagons |
| Years covered | 2020–2026 | 2019–2027 |
| Configurations on record | 20 | 17 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
GLB-Class vs Cullinan: common questions
Which is better on gas, the Mercedes-Benz GLB-Class or the Rolls-Royce Cullinan?
The Mercedes-Benz GLB-Class is the more efficient of the two: it reaches 28 mpg combined versus 14 mpg for the Rolls-Royce Cullinan, a 14 mpg advantage and costs about $2,750 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Mercedes-Benz GLB-Class runs about $2,700 a year in fuel at its most efficient configuration, versus about $5,450 for the Rolls-Royce Cullinan — a difference of roughly $2,750 per year.
What engines do the GLB-Class and Cullinan offer?
Mercedes-Benz GLB-Class: SIDI; Mild Hybrid, SIDI. Rolls-Royce Cullinan: SIDI.
Are they in the same vehicle class?
The EPA classifies the Mercedes-Benz GLB-Class as Small Sport Utility Vehicle 4WD and the Rolls-Royce Cullinan as Midsize Station Wagons, so they aren't a like-for-like match on size.
More GLB-Class comparisons
Comparison id: mercedes-benz-glb-class-vs-rolls-royce-cullinan