2021 head-to-head · Small SUV
2021 Cadillac XT6 vs Mercedes-Benz GLB-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 2021 Cadillac XT6 is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas and $3.95/gal premium gas, it costs about $2,214 a year to fuel (21 MPG), versus $2,279 for the 2021 Mercedes-Benz GLB-Class (26 MPG). That's roughly $65 a year, or about $323 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
- Cadillac XT6
- Mercedes-Benz GLB-Class
Side by side
| Cadillac XT6 | Mercedes-Benz GLB-Class | |
|---|---|---|
| $2,214 | Your annual fuel cost | $2,279 |
| 21 MPG | Combined efficiency | 26 MPG |
| 19 MPG | City | 23 MPG |
| 26 MPG | Highway | 31 MPG |
| 418 g/mi | Tailpipe CO₂ (g/mi) | 337 g/mi |
| 4/10 | EPA fuel economy score | 5/10 |
| 4/10 | EPA greenhouse gas score | 5/10 |
| Gas | Powertrain | Gas |
| Regular gasoline | Fuel | Premium gasoline |
| 3.6L 6-cyl | Engine / motor | 2.0L 4-cyl turbo |
| 9-speed automatic | Transmission | 8-speed dual-clutch |
| FWD | Drivetrain | FWD |
✓ 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.
Cadillac XT6 vs Mercedes-Benz GLB-Class across model years
- Cadillac XT6
- Mercedes-Benz GLB-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 92 2021 small SUVs, the Cadillac XT6 ranks 70th and the Mercedes-Benz GLB-Class 74th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2021 Cadillac XT6 or the 2021 Mercedes-Benz GLB-Class?
Measured by cost to drive, the Cadillac XT6. The Cadillac XT6 is rated 21 MPG combined and the Mercedes-Benz GLB-Class 26 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2021 Cadillac XT6 vs. the Mercedes-Benz GLB-Class per year?
At 15,000 miles a year with $3.10/gal regular gas and $3.95/gal premium gas, about $2,214 for the Cadillac XT6 and $2,279 for the Mercedes-Benz GLB-Class.
Cadillac XT6 vs Mercedes-Benz GLB-Class in other years
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