Does the 2026 Mercedes-Benz GLS need premium gas?
Yes. Premium.
$343extra a year
- Premium listed for the GLS 450 4MATIC AWD.
- All 2 trims list premium.
- Required or only recommended: the data does not say.
- 52% of 138 SUVs (2026) list premium.
12,000 miles a year. Gas $3.20. Premium $0.60 more.
| Trim | Engine | Grade | Mpg | Regular, a year | Premium, a year |
|---|---|---|---|---|---|
| GLS 450 4MATIC AWD | 3.0L 6cyl | Premium | 21 | $1,829 | $2,171 |
| GLS 580 4MATIC AWD | 4.0L 8cyl | Premium | 16 | $2,400 | $2,850 |
Rivals
| Car | Cheapest trim | Grade |
|---|---|---|
| 2026 Mercedes-Benz GLS | GLS 450 4MATIC AWD | Premium |
| 2026 Cadillac Escalade | RWD | Premium |
| 2026 Lincoln Navigator | Premiere 4WD | Premium |
| 2026 BMW X7 | xDrive40i AWD | Premium |
| 2026 Audi SQ7 | Premium Plus AWD | Premium |
| 2026 Porsche Cayenne | AWD | Premium |
What this cannot tell you
Check the fuel door or manual before you fill.
Gas prices and the premium gap change by state.
- 2 or more sources
- 1 source
- Model-level, rule or estimate
- Sources disagree