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Mercedes-Benz GLS-Class
2020 · gas, suv
7 measured figures
7 of the 9 figures this market publishes for a car like this one are measured for this car. This market publishes no overall score, so there is no share of a composite weight to measure confidence against; figures_measured says how many of this market's figures the row carries, and contributing_publishers says who measured them
Measured figures
Fuel economy20.6 mpg (US gallons)Measured by NRCan · configuration: GLS 450 4MATIC · also 11.4 L/100 km
Tailpipe CO₂266 g/kmMeasured by NRCan · CO₂ basis: tailpipe_rated · configuration: GLS 450 4MATIC · also 428 g/mile
HorsepowerFree with an accountMeasured for this car, with its publisher and basis
Kerb weightFree with an accountMeasured for this car, with its publisher and basis
EPA test weightFree with an accountMeasured for this car, with its publisher and basis
WarrantyFree with an accountMeasured for this car, with its publisher and basis
Recall campaignsFree with an accountMeasured for this car, with its publisher and basis
5 more measured figures for this car — Horsepower, Kerb weight, EPA test weight, Warranty, Recall campaigns — each with the publisher that measured it and the basis it is on. Free to read with an account.
Figures this car does not carry
Fuel economy (MPGe)Not published for this carFuel economy (MPGe) is published for electric and hydrogen cars, whose economy is published as MPGe: energy converted at 33.7 kWh per gallon, not fuel burned; this car is not one of them, so the figure is not the same quantity for it
Tailpipe CO₂ (charge-weighted)Not published for this carthis car's CO₂ is published as the tailpipe rating for the car driven as rated on the test cycle (266 g/km), not as a composite weighted across electric and fuel-burning miles, so it is not the quantity this list orders. It is published as Tailpipe CO₂
Engine horsepowerNot published for this carNot published for this car. The record's own reason is free to read with an account.
NHTSA overall ratingNot published for this carNot published for this car. The record's own reason is free to read with an account.
Complaints per 10,000 builtNot published for this carNot published for this car. The record's own reason is free to read with an account.
PriceNot published for this carNot published for this car. The record's own reason is free to read with an account.
5-Year Running Costs
| Fuel | US$10,848 |
| Insurance | US$8,450 (modelled) |
| Maintenance | US$7,800 (class estimate) |
| Repairs | US$8,000 (modelled) |
| Depreciation | not estimated — we hold no purchase price for this car, and it is not assumed. |
| Total | not estimated — a component above is unknown or modelled |
Running costs only — the purchase price is not included. The five-year running cost is an ESTIMATE, not a measurement of this car: only its fuel half is computed from the car's own measured consumption and a dated pump price (see fuel_price_source and fuel_price_as_of in the market's own figures); insurance, maintenance and repairs are class models. It orders no list and is not one of this market's published figures. Fuel is this car's own combined consumption over 15,000 km a year at 1.738 CAD a litre of petrol (Statistics Canada. Table 18-10-0001-01 Monthly average retail prices for gasoline and fuel oil, by geography; Canada; regular unleaded gasoline at self service filling stations, 2026-08). Adapted from Statistics Canada, Table 18-10-0001-01 Monthly average retail prices for gasoline and fuel oil, by geography, August 2026. This does not constitute an endorsement by Statistics Canada of this product. Costs are in US dollars; the CAD pump price is converted at 1 CAD = 0.73 USD, the rate set on 2026-09-13. Insurance, maintenance and repairs are models, not figures for this car: insurance from its power, weight and crash rating, maintenance from its make's class, repairs from its complaint and recall counts. They are shown for scale and are not used to rank it. Confidence is low: several components are modelled from class averages.
Known Issues
ELECTRICAL SYSTEM
18 complaint(s) · 2 report a crash, fire, injury or death
WHILE DRIVING THE VEHICLE, A SERIES OF ELECTRICAL SYSTEM WARNINGS WERE DISPLAYED IN RAPID SUCCESSION. SHORTLY THEREAFTER, THE VEHICLE LOST POWER, THE ENGINE SHUT OFF, AND THE VEHICLE BEGAN TO GLIDE. T…
ENGINE
9 complaint(s) · 1 reports a crash, fire, injury or death
On a long road trip - about halfway on [XXX] - received an error message on 48v system malfunction - immediately called nearest Mercedes dealership (Richmond Va) to schedule a service - while on the l…
FUEL/PROPULSION SYSTEM
8 complaint(s) · 2 report a crash, fire, injury or death
TL* THE CONTACT OWNS A 2020 MERCEDES-BENZ GLS450. THE CONTACT STATED SHE NOTICED A FUEL ODOR COMING FROM THE VEHICLE WHEN THE WINDOWS WERE OPEN. THE CONTACT SOUGHT MEDICAL ATTENTION DUE TO BREATHING P…
POWER TRAIN
4 complaint(s)
On numerous occasions the transmission does not fully down shift to the next lower gear and then when I have to accelerate quickly it will drop down to the lower gear like it’s supposed to but won’t…
UNKNOWN OR OTHER
4 complaint(s) · 1 reports a crash, fire, injury or death
The sunroof spontaneously shattered while driving down the interstate. No other cars involved and no rocks or debris caused it. It was inspected and repaired at a Mercedes dealer, however, Mercedes re…
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
3 complaint(s)
We intermittently experience phantom braking, including on the highway with no objects or vehicles ahead of us (for example, not on a curve, no vehicle visible within half a kilometer). Vehicle abrupt…
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
3 complaint(s) · 2 report a crash, fire, injury or death
FORWARD COLLISION AVOIDANCE: WARNINGS
3 complaint(s)
On a sunny afternoon without zero clouds in the sky, 75 degrees I was driving at 35 mph on a two-lane road with no cars in front of me, behind me, or coming in the other direction, the brakes were urg…
AIR BAGS
2 complaint(s) · 2 report a crash, fire, injury or death
SERVICE BRAKES
2 complaint(s) · 1 reports a crash, fire, injury or death
The passenger rear wheel brake caliper lower bolt got loose. The bolt is most likely not available for inspection. The caliper body then started rubbing against the wheel inside surface and caused a n…
The 10 components named in the most complaints are shown, of 19 named in all.
Data sources
- NRCan — fuel consumption ratings and vehicle class
- NHTSA — crash-test ratings, recalls and owner complaints
- New York State DMV — New York registrations, the cross-check on that denominator
- NHTSA — system horsepower, and curb weight averaged across a compliance configuration's trims, from the CAFE analysis fleet
- carstandings.com — basic-warranty terms, from this site's reviewed table
- EPA — horsepower and EPA test weight, from the Test Car List
- EPA — production volumes by make, from Automotive Trends
- NHTSA — body style and the crash-tested vehicle's curb weight, from the NCAP crash-test file
- NHTSA — body style and engine horsepower, from the vPIC VIN decoder