2018 head-to-head · Midsize & Large SUV
2018 BMW X6 vs Mercedes-Benz GLS-Class
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
The 2018 BMW X6 is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,821 a year to fuel (21 MPG), versus $3,118 for the 2018 Mercedes-Benz GLS-Class (19 MPG). That's roughly $297 a year, or about $1,485 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- BMW X6
- Mercedes-Benz GLS-Class
Side by side
| BMW X6 | Mercedes-Benz GLS-Class | |
|---|---|---|
| $2,821 | Your annual fuel cost | $3,118 |
| 21 MPG | Combined efficiency | 19 MPG |
| 18 MPG | City | 17 MPG |
| 25 MPG | Highway | 22 MPG |
| 426 g/mi | Tailpipe CO₂ (g/mi) | 477 g/mi |
| 4/10 | EPA fuel economy score | 3/10 |
| 4/10 | EPA greenhouse gas score | 3/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 3.0L 6-cyl turbo | Engine / motor | 3.0L 6-cyl turbo |
| 8-speed automatic | Transmission | 9-speed automatic |
| RWD | Drivetrain | 4WD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
BMW X6 vs Mercedes-Benz GLS-Class across model years
- BMW X6
- Mercedes-Benz GLS-Class
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Among 42 2018 midsize & large SUVs, the BMW X6 ranks 29th and the Mercedes-Benz GLS-Class 35th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2018 BMW X6 or the 2018 Mercedes-Benz GLS-Class?
Measured by cost to drive, the BMW X6. The BMW X6 is rated 21 MPG combined and the Mercedes-Benz GLS-Class 19 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2018 BMW X6 vs. the Mercedes-Benz GLS-Class per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,821 for the BMW X6 and $3,118 for the Mercedes-Benz GLS-Class.
BMW X6 vs Mercedes-Benz GLS-Class in other years
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