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2020 Mercedes-Benz GLC-Class Gas Tank Size & Fuel Capacity

SUV 5 trims listed 1 fuel-system recall ← 2019 2021 →

Fuel tank capacity

17.4gal · 66 L

The 2020 Mercedes-Benz GLC-Class has a fuel tank capacity of 17.4 gallons (66 liters) on every trim.

A full tank is good for roughly 383–505 highway miles or 278–400 miles around town, going by the EPA ratings.

17.4 gal · Smaller than 54% of 2020 models we list.

Listed separately: 2020 Mercedes-Benz GLC-Class Coupe (17.4 gal).

Highway range
383–505 mi
City range
278–400 mi
Fuel
Premium unleaded (required)
EPA combined
18–25 MPG
EPA size class
Small Sport Utility Vehicle

2020 Mercedes-Benz GLC-Class fuel tank capacity by trim

What changes the tank sizeTap an option to filter the table

Powertrain
no difference
Drive
no difference
Engine
no difference

All 5 trims

MPG and range are city / highway.

TrimEngineDrive Tank MPG city / hwy Range city / hwy
AMG GLC 43 4dr SUV AWD 3.0L 6cyl Turbo 9A · AWD MPG 18 / 24Range 313 / 418 mi 3.0L 6cyl Turbo 9A AWD 17.4 gal66 L 18 / 24 313 / 418 mi
AMG GLC 63 4dr SUV AWD 4.0L 8cyl Turbo 9A · AWD MPG 16 / 22Range 278 / 383 mi 4.0L 8cyl Turbo 9A AWD 17.4 gal66 L 16 / 22 278 / 383 mi
GLC 300 4MATIC 4dr SUV AWD 2.0L 4cyl Turbo 9A · AWD MPG 21 / 28Range 365 / 487 mi 2.0L 4cyl Turbo 9A AWD 17.4 gal66 L 21 / 28 365 / 487 mi
GLC 300 4dr SUV 2.0L 4cyl Turbo 9A · RWD MPG 22 / 29Range 383 / 505 mi 2.0L 4cyl Turbo 9A RWD 17.4 gal66 L 22 / 29 383 / 505 mi
GLC 350e 4MATIC 4dr SUV AWD 2.0L 4cyl Turbo 9A · AWD Plug-in hybrid MPG 23 / 28Range 400 / 487 mi 2.0L 4cyl Turbo 9A Plug-in hybrid AWD 17.4 gal66 L 23 / 28 400 / 487 mi

Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.

How far a 2020 Mercedes-Benz GLC-Class goes on a tank

Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 24 MPG, a full 17.4-gallon tank covers about 418 miles.

GaugeGallonsHighway milesCity miles
Full17.4487365
3/413.1365274
1/28.7244183
1/44.412291
1/82.26146

Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 625 gallons, roughly 36 full tanks.

Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.

EPA combined
18–25 MPG
Tailpipe CO2
176–489 g/mi
EPA greenhouse score
3–10 of 10
Source
EPA ratings

What it costs to fill up a 2020 Mercedes-Benz GLC-Class

$91.87 to fill the 17.4-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.

TankFuelUS avg / galFrom emptyFrom 1/4 tank
17.4 galPremium$5.28$91.87$68.90

By region, 17.4-gallon tank

RegionPremium / galFill from empty
East Coast$4.93$85.78
Midwest$5.37$93.44
Gulf CoastLowest$4.57$79.52
Rocky Mountain$5.12$89.09
West Coast$6.08$105.79
CaliforniaHighest$6.36$110.66

Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.

Your own price

  • 17.4-gallon tank$91.87
  • A year of driving (15,000 mi)$3,300

Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.

GLC-Class tank size in other years

The tank changed for 2020: 17.4 gal, up from 13.2–17.4 gal on the 2019 GLC-Class.

Model yearTankLongest highway range
2025 GLC-Class 16.4–17.4 gal 557 mi
2024 GLC-Class 17.4 gal 557 mi
2023 GLC-Class 17.4 gal 539 mi
2022 GLC-Class 17.4 gal 505 mi
2021 GLC-Class 17.4 gal 505 mi
2020 GLC-Class 17.4 gal 505 mi
2019 GLC-Class 13.2–17.4 gal 470 mi
2018 GLC-Class 13.2–17.4 gal 487 mi
2017 GLC-Class 17.4 gal 487 mi
Mercedes-Benz GLC-Class fuel tank by model yearSmallest tank Larger tank options
201720182019202020212022202320242025
← 2019 Mercedes-Benz GLC-Class Every GLC-Class year 2021 Mercedes-Benz GLC-Class →

2020 Mercedes-Benz GLC-Class vs similar 2020 SUVs

At 17.4 gallons, the GLC-Class's largest tank ranks fifth of the seven 2020 SUVs compared here. The Volvo XC60 carries the most (18.8 gal) and the Lexus NX 300h the least (14.8 gal).

2020 modelTankLongest highway range
Volvo XC60 18.5–18.8 gal 545 mi
Audi Q5 15.3–18.5 gal 518 mi
BMW X3 13.2–17.7 gal 499 mi
Land Rover Discovery Sport 17.7 gal 425 mi
Mercedes-Benz GLC-Class 17.4 gal 505 mi
Alfa Romeo Stelvio 16.9 gal 490 mi
Lexus NX 300h 14.8 gal 444 mi

Other 2020 SUVs of a similar size, one model per brand.

2020 Mercedes-Benz GLC-Class fuel system recalls

NHTSA lists 1 fuel-system recall for the 2020 Mercedes-Benz GLC-Class, out of 20 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.

Fuel injection system · Fuel railDec 13, 2021 · NHTSA 21V961000 · Mercedes-Benz USA, LLC · 139 vehicles

Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2019 AMG G63, C300, E300, G550, AMG GT63, AMG GT53, 2019-2020 A220, GLA250, GLC300, 2016 C300, 2020 AMG A35, AMG C43, AMG C63, CLA250, E350, E450, GLB250, GLE450, GLS450, GLS580, S560, and SL550 vehicles equipped with a gasoline engine. During the manufacturing process, particles may have been trapped between the fuel rail and injectors, which can cause a fuel leak.

Risk and remedy

Risk: A fuel leak in the presence of an ignition source, such as hot engine or exhaust components, can increase the risk of a fire.

Remedy: Dealers will replace the fuel rail and fuel injectors, free of charge. Owner notification letters were mailed April 22, 2022. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for the recall is 2022030003.

All Mercedes-Benz fuel recalls Look up your tank by VIN

Frequently asked questions

What is the fuel tank capacity of the 2020 Mercedes-Benz GLC-Class?

The 2020 Mercedes-Benz GLC-Class holds 17.4 gallons (66 liters) on every trim we list.

How many gallons and liters does the 2020 Mercedes-Benz GLC-Class gas tank hold?

The 2020 Mercedes-Benz GLC-Class tank holds 66 liters, or 17.4 gallons in US gallons.

Does the 2020 Mercedes-Benz GLC-Class tank change with the powertrain?

No. Gas and Plug-in hybrid versions of the 2020 Mercedes-Benz GLC-Class use the same 17.4 gal tank.

Does AWD change the 2020 Mercedes-Benz GLC-Class gas tank?

No. AWD and RWD versions of the 2020 Mercedes-Benz GLC-Class use the same 17.4 gal tank.

How far can a 2020 Mercedes-Benz GLC-Class go on a full tank?

About 383–505 miles on the highway and 278–400 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.

How many miles can a 2020 Mercedes-Benz GLC-Class go on a quarter tank?

About 122 highway miles or 91 in town from the 17.4-gallon tank, which has roughly 4.4 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.

What gas does the 2020 Mercedes-Benz GLC-Class take?

Premium unleaded (required). The label inside the fuel door confirms it for your car.

How much does it cost to fill up a 2020 Mercedes-Benz GLC-Class?

At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 17.4-gallon tank from empty costs $91.87. It ranges from $79.52 in the Gulf Coast to $110.66 in California.

How much does a full tank of gas weigh in a 2020 Mercedes-Benz GLC-Class?

About 108 pounds for the 17.4-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.

Does the 2020 Mercedes-Benz GLC-Class have a bigger gas tank than the Lexus NX 300h?

Yes. The 2020 Mercedes-Benz GLC-Class holds up to 17.4 gallons; the 2020 Lexus NX 300h holds up to 14.8.

Has the 2020 Mercedes-Benz GLC-Class had a fuel pump or fuel system recall?

Yes. NHTSA lists 1 fuel-system recall for the 2020 Mercedes-Benz GLC-Class: 21V961000 (fuel injection system · fuel rail). Check your VIN at nhtsa.gov/recalls to see if your car is affected.

Sources

  • Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
  • MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
  • Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
  • Recalls: NHTSA recall database (Mercedes-Benz fuel system recalls).

Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.

Other 2020 Mercedes-Benz models

A-Class13.5 gallons AMG® GT19.8–21.1 gallons C-Class17.4 gallons CLA-Class13.5 gallons CLS-Class21.1 gallons E-Class17.4–21.1 gallons G-Class26.4 gallons GLA-Class14.8 gallons GLB-Class15.9 gallons GLC-Class Coupe17.4 gallons GLE-Class22.5 gallons GLS-Class23.8 gallons