2018 Mercedes-Benz GLS-Class
Fuel economy, running costs, emissions and safety · from U.S. EPA and NHTSA data
The 2018 Mercedes-Benz GLS-Class is sold in the U.S. with gasoline power. The EPA lists 3 configurations for this model year, with combined economy from 15 to 19 MPG and an estimated annual fuel cost of $4,200 to $5,300 at 15,000 miles.
Key numbers
| Model year | 2018 |
|---|---|
| Vehicle class | Standard Sport Utility Vehicle 4WD |
| Fuel type(s) | Gasoline |
| Combined economy | 15-19 MPG |
| Best / worst combined | 19 / 15 MPG |
| Annual fuel cost | $4,200-$5,300 |
| Tailpipe CO₂ | 477-591 g/mi |
| EPA smog rating | 3-3 / 10 |
What it costs to fuel
Across its configurations, the 2018 GLS-Class costs about $4,200 to $5,300 a year to fuel at the EPA's 15,000-mile basis, averaging roughly $4,833. Over five years that is about $24,167 in fuel alone before maintenance, insurance and depreciation — which is why the running cost, not just the price, decides what a car really costs.
Relative to an average new vehicle, this GLS-Class configuration spends about $9,500 more on fuel over five years.
For context, the average combined economy of standard sport utility vehicle 4wd in this dataset is about 23 MPG. The GLS-Class sits roughly 6 MPG below that mark at its midpoint, making it thirstier than average for its EPA class.
Configurations and fuel economy
| Version | Engine | Drive | Trans | Fuel | Combined | Annual fuel |
|---|---|---|---|---|---|---|
| GLS450 4matic | 3.0L 6-cyl turbo | 4-Wheel | Automatic | Gasoline | 19 MPG | $4,200 |
| GLS550 4matic | 4.7L 8-cyl turbo | 4-Wheel | Automatic | Gasoline | 16 MPG | $5,000 |
| AMG GLS63 | 5.5L 8-cyl turbo | 4-Wheel | Automatic | Gasoline | 15 MPG | $5,300 |
Emissions, safety and size
The 2018 GLS-Class records tailpipe CO₂ of 477-591 g/mi, an EPA smog rating of 3-3 out of 10. The EPA classifies it as standard sport utility vehicle 4wd.
Compare this car
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Data: U.S. EPA FuelEconomy.gov (public domain) and NHTSA SafetyRatings. Figures are EPA estimates; real-world results vary.