2026 Mercedes-Benz GLS mpg
Combined mpg, GLS 450 4MATIC AWD
21mpg
- 19 city, 24 highway.
- 2 mpg below the median of 139 SUVs (2026).
- 4 trims: 15 to 21 mpg.
12,000 miles a year. Gas $3.20.
| Trim | Engine | Drive | City mpg | Hwy mpg | Combined | Tank, gal | Miles per tank | Cost a year |
|---|---|---|---|---|---|---|---|---|
| GLS 450 4MATIC AWD | 3.0L 6cyl | AWD | 19 | 24 | 21 | 23.8 | 500 | $1,829 |
| AMG GLS 63 4MATIC | 4.0L | AWD | 15 | 20 | 17 | 23.8 | 405 | $2,259 |
| GLS 580 4MATIC AWD | 4.0L 8cyl | AWD | 14 | 20 | 16 | 23.8 | 381 | $2,400 |
| Maybach GLS 600 4MATIC SUV | 4.0L | AWD | 13 | 18 | 15 | 23.8 | 357 | $2,560 |
Fuel cost
GLS 450 4MATIC AWD, 21 mpg combined.
- Per year
- $1,829
- Per month
- $152
- Per mile
- 15.2 cents
- Fill the tank
- $76.16
- Top trim: Maybach GLS 600 4MATIC SUV. $2,560 a year. $731 more than the GLS 450 4MATIC AWD.
Trip cost
| Trip | Gallons | Cost |
|---|---|---|
| 100 miles | 4.2 | $13.33 |
| 300 miles | 12.5 | $40.00 |
| 500 miles | 20.8 | $66.67 |
| 1,000 miles | 41.7 | $133 |
Commute cost
- Per month
- $132
- Per year
- $1,585
- Miles a month
- 867
GLS 450 4MATIC AWD. 20 miles each way, 5 days a week.
Is 21 mpg good? No. Beats 26% of 2026 cars.
MPG by year
Rivals
| Car | Cheapest trim | MPG or range | Compare |
|---|---|---|---|
| 2026 Mercedes-Benz GLS | GLS 450 4MATIC AWD | 21 mpg | |
| 2026 Mercedes-Benz EQS SUV | EQS 400 4MATIC AWD | 312 mi range | |
| 2026 Cadillac Escalade | RWD | 17 mpg | Compare |
| 2026 Lincoln Navigator | Premiere 4WD | 17 mpg | Compare |
| 2026 BMW X7 | xDrive40i AWD | 23 mpg | Compare |
| 2026 Audi SQ7 | Premium Plus AWD | 16 mpg | |
| 2026 Porsche Cayenne | AWD | 19 mpg |
What this cannot tell you
EPA ratings. Your own mpg will differ.
Gas prices change by state and by week.
- 2 or more sources
- 1 source
- Model-level, rule or estimate
- Sources disagree