Mercedes-Benz GLS-Class

Fuel economy, running costs and specs by model year

The Mercedes-Benz GLS-Class appears in this database in 4 model years, from 2017 to 2020, offered with gasoline and hybrid power. Combined economy ranges from 14 to 21 MPG across those years, with annual fuel costs of $3,800 to $5,700 at 15,000 miles.

Fuel economy by year

How it compares

Against the average standard sport utility vehicle 4wd in this dataset (about 23 MPG), the GLS-Class sits roughly 5 MPG below that mark on average, making it a thirstier-than-average choice for its class.

Five-year fuel cost

Fuelling a GLS-Class for five years at the EPA's 15,000-mile basis costs roughly $19,000 to $28,500, averaging about $23,750 across the versions here. That is the energy bill alone — it excludes insurance, maintenance and depreciation, which for most owners together exceed what goes into the tank.

The range within the range

Economy across the GLS-Class varies by about 7 MPG between its most and least frugal versions, which run on gasoline and hybrid. Engine size, turbocharging, drivetrain and even wheel size explain most of that gap, so when you shop a used GLS-Class check which version you are looking at before comparing its running cost to another car.

How it changed over time

Between 2017 and 2020 the GLS-Class's average combined economy improved from about 16 to 20 MPG. Redesigns, new engines and added hybrid or electric versions are usually what move the number, so the year you choose can matter as much as the model.

Best year for fuel economy

The 2020 GLS-Class has the strongest average combined economy in this database at about 20 MPG, while the 2017 is the lowest at about 16 MPG. If running cost is your priority, that is the year to target on the used market; later years may add equipment or safety features instead.

2020 GLS-Class at a glance

Use the comparison tool to set the GLS-Class against a rival, or go back to all Mercedes-Benz models.