2018 Mercedes-Benz CLS-Class
Fuel economy, running costs, emissions and safety · from U.S. EPA and NHTSA data
The 2018 Mercedes-Benz CLS-Class is sold in the U.S. with gasoline power. The EPA lists 3 configurations for this model year, with combined economy from 18 to 21 MPG and an estimated annual fuel cost of $3,800 to $4,450 at 15,000 miles.
Key numbers
| Model year | 2018 |
|---|---|
| Vehicle class | Compact Cars |
| Fuel type(s) | Gasoline |
| Combined economy | 18-21 MPG |
| Best / worst combined | 21 / 18 MPG |
| Annual fuel cost | $3,800-$4,450 |
| Tailpipe CO₂ | 425-495 g/mi |
| EPA smog rating | 1-3 / 10 |
What it costs to fuel
Across its configurations, the 2018 CLS-Class costs about $3,800 to $4,450 a year to fuel at the EPA's 15,000-mile basis, averaging roughly $4,083. Over five years that is about $20,417 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 CLS-Class configuration spends about $7,500 more on fuel over five years.
For context, the average combined economy of compact cars in this dataset is about 29 MPG. The CLS-Class sits roughly 9 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 |
|---|---|---|---|---|---|---|
| CLS550 | 4.7L 8-cyl turbo | Rear-Wheel | Automatic | Gasoline | 21 MPG | $3,800 |
| CLS550 4matic | 4.7L 8-cyl turbo | 4-Wheel | Automatic | Gasoline | 20 MPG | $4,000 |
| AMG CLS63 S 4matic | 5.5L 8-cyl turbo | 4-Wheel | Automatic | Gasoline | 18 MPG | $4,450 |
Emissions, safety and size
The 2018 CLS-Class records tailpipe CO₂ of 425-495 g/mi, an EPA smog rating of 1-3 out of 10. The EPA classifies it as compact cars.
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.