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2026 Mercedes-Benz GLS-Class Specs: MPG, Gas Mileage, Engine Size & Dimensions

2017–2026 model years35 variantsUp to 21 MPG combined
Real-World MPG QuestionsBed Dimensions & Cargo SpaceService Intervals

Mercedes-Benz GLS-Class maintenance schedule by model year

Verified year-by-year intervals for 2020–2020 are listed on the Mercedes-Benz GLS-Class maintenance schedule, where you can switch model year in the table.

2026 Mercedes-Benz GLS-Class Specs at a Glance

The 2026 Mercedes-Benz GLS-Class gets 21 mpg combined on the 3.0L All-Wheel Drive configuration, weighs 6,074 lbs, measures 205.9 in long. Figures are per configuration, not a single official number — other trims rate as low as 15 mpg combined. Every figure below comes from EPA, NHTSA, or manufacturer published data — no estimates.

Combined MPG
21 mpg (19 city / 24 hwy)
Best configuration: 3.0L · All-Wheel Drive · Automatic 9-spd · other 2026 trims rate 15–21 mpg combined
Engine
3.0L 6-cyl
3.0L · All-Wheel Drive · Automatic 9-spd · 2 powertrains offered
Curb weight
6,074 lbs
Heaviest recorded configuration: GLS CLASS AMG 63 4MATIC 4DR SUV
Length
205.9 in · 79.9 in wide · 71.7 in tall
Wheelbase
123.2 in

2026 Mercedes-Benz GLS-Class trims and MPG

TrimEngineTransDriveCityHwyCombined
Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spdAll-Wheel Drive192421
Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive142016
Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive131815
Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive152017

Detailed Specifications

MPG & Fuel Economy

MPG for every year and trim

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Engine Specifications

Engine Specs for every year and trim

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Annual Fuel Cost

Fuel Cost for every year and trim

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Transmission Specifications

Transmission for every year and trim

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Drivetrain & Drive Type

Drivetrain for every year and trim

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Vehicle Class & EPA Size Category

Vehicle Class for every year and trim

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Maintenance Schedule & Service Intervals

Maintenance for every year and trim

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Dimensions & Size

Dimensions for every year and trim

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Curb Weight

Curb Weight for every year and trim

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Mercedes-Benz GLS-Class — All Years Overview

YearTrimEngineTransDriveCityHwyCombinedFuel
2026Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spdAll-Wheel Drive192421Premium Gasoline
2026Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive142016Premium Gasoline
2026Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive131815Premium Gasoline
2026Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive152017Premium Gasoline
2025Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spdAll-Wheel Drive192421Premium Gasoline
2025Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive141815Premium Gasoline
2025Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive141916Premium Gasoline
2025Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive131815Premium Gasoline
2024Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spdAll-Wheel Drive192421Premium Gasoline
2024Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive142016Premium Gasoline
2024Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive141816Premium Gasoline
2024Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive141916Premium Gasoline
2023Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spdAll-Wheel Drive182320Premium Gasoline
2023Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive141916Premium Gasoline
2023Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive152017Premium Gasoline
2023Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive162118Premium Gasoline
2022Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spd4-Wheel Drive182420Premium Gasoline
2022Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive141815Premium Gasoline
2022Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive162118Premium Gasoline
2022Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spdAll-Wheel Drive142017Premium Gasoline
2021Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spd4-Wheel Drive202421Premium Gasoline
2021Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spd4-Wheel Drive162118Premium Gasoline
2021Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spd4-Wheel Drive141816Premium Gasoline
2021Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spd4-Wheel Drive151916Premium Gasoline
2020Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spd4-Wheel Drive192321Premium Gasoline
2020Auto 9-spd, 8 cyl, 4.0 L8 · 4.0LAutomatic 9-spd4-Wheel Drive162118Premium Gasoline
2019Auto 7-spd, 8 cyl, 5.5 L8 · 5.5LAutomatic 7-spd4-Wheel Drive131815Premium Gasoline
2019Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spd4-Wheel Drive162218Premium Gasoline
2019Auto 9-spd, 8 cyl, 4.7 L8 · 4.7LAutomatic 9-spd4-Wheel Drive141916Premium Gasoline
2018Auto 7-spd, 8 cyl, 5.5 L8 · 5.5LAutomatic 7-spd4-Wheel Drive131815Premium Gasoline
2018Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spd4-Wheel Drive172219Premium Gasoline
2018Auto 9-spd, 8 cyl, 4.7 L8 · 4.7LAutomatic 9-spd4-Wheel Drive141916Premium Gasoline
2017Auto 7-spd, 8 cyl, 5.5 L8 · 5.5LAutomatic 7-spd4-Wheel Drive131714Premium Gasoline
2017Auto 9-spd, 6 cyl, 3.0 L6 · 3.0LAutomatic 9-spd4-Wheel Drive172219Premium Gasoline
2017Auto 9-spd, 8 cyl, 4.7 L8 · 4.7LAutomatic 9-spd4-Wheel Drive141816Premium Gasoline

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Mercedes-Benz GLS-Class — Frequently Asked Questions

What is the fuel economy of the 2026 Mercedes-Benz GLS-Class?

The Mercedes-Benz GLS-Class is EPA-rated at up to 21 MPG combined (19 city / 24 highway).

What engine does the 2026 Mercedes-Benz GLS-Class have?

The Mercedes-Benz GLS-Class uses a 3.0L 6-cylinder engine paired with an Automatic 9-spd transmission.

What years of the Mercedes-Benz GLS-Class are covered here?

This page documents 35 verified Mercedes-Benz GLS-Class configurations across model years 2017–2026.

Which model year of the Mercedes-Benz GLS-Class is the most fuel efficient?

The 2026 Mercedes-Benz GLS-Class holds the highest combined rating at 21 MPG; the 2019 sits lowest at 18 MPG, a difference of 3 MPG (about 17%) across the 10 rated years on file.

How many engine options does the Mercedes-Benz GLS-Class have?

The records list 4 distinct displacements for the Mercedes-Benz GLS-Class — 3L, 4L, 4.7L, 5.5L — which is why combined MPG varies between trims of the same year.

Is the 2026 Mercedes-Benz GLS-Class front-wheel drive or all-wheel drive?

The Mercedes-Benz GLS-Class appears in 2 drivetrain layouts across the years documented here — All-Wheel Drive, 4-Wheel Drive — with the latest 2026 record on All-Wheel Drive.

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