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

Convertible 2 trims listed 1 fuel-system recall ← 2019 2022 →

Fuel tank capacity

19.8gal · 75 L

The 2020 Mercedes-Benz SL-Class has a fuel tank capacity of 19.8 gallons (75 liters) on every trim.

A full tank is good for roughly 495–554 highway miles or 337–396 miles around town, going by the EPA ratings.

19.8 gal · Bigger than 67% of 2020 models we list.

Highway range
495–554 mi
City range
337–396 mi
Fuel
Premium unleaded (required)
EPA combined
20–22 MPG
EPA size class
Two Seaters

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

What changes the tank sizeTap an option to filter the table

Engine
no difference

All 2 trims

MPG and range are city / highway.

TrimEngineDrive Tank MPG city / hwy Range city / hwy
SL 450 2dr Convertible 3.0L 6cyl Turbo 9A · RWD MPG 20 / 28Range 396 / 554 mi 3.0L 6cyl Turbo 9A RWD 19.8 gal75 L 20 / 28 396 / 554 mi
SL 550 2dr Convertible 4.7L 8cyl Turbo 9A · RWD MPG 17 / 25Range 337 / 495 mi 4.7L 8cyl Turbo 9A RWD 19.8 gal75 L 17 / 25 337 / 495 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 SL-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 22 MPG, a full 19.8-gallon tank covers about 436 miles.

GaugeGallonsHighway milesCity miles
Full19.8554396
3/414.9416297
1/29.9277198
1/45.013999
1/82.56950

Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 682 gallons, roughly 34 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
20–22 MPG
Tailpipe CO2
395–435 g/mi
EPA greenhouse score
4 of 10
Source
EPA ratings

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

$104.54 to fill the 19.8-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.

TankFuelUS avg / galFrom emptyFrom 1/4 tank
19.8 galPremium$5.28$104.54$78.41

By region, 19.8-gallon tank

RegionPremium / galFill from empty
East Coast$4.93$97.61
Midwest$5.37$106.33
Gulf CoastLowest$4.57$90.49
Rocky Mountain$5.12$101.38
West Coast$6.08$120.38
CaliforniaHighest$6.36$125.93

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

  • 19.8-gallon tank$104.54
  • A year of driving (15,000 mi)$3,600

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

SL-Class tank size in other years

The 2020 SL-Class uses the same 19.8 gal tank as every SL-Class since 2013.

Model yearTankLongest highway range
2025 SL-Class 18.5 gal 500 mi
2024 SL-Class 18.5 gal 500 mi
2023 SL-Class 18.5 gal 500 mi
2022 SL-Class 18.5 gal 389 mi
2020 SL-Class 19.8 gal 554 mi
2019 SL-Class 19.8 gal 554 mi
2018 SL-Class 19.8 gal 554 mi
2017 SL-Class 19.8 gal 554 mi
2016 SL-Class 19.8 gal 535 mi
2015 SL-Class 19.8 gal 535 mi
Mercedes-Benz SL-Class fuel tank by model year
19941995199619971998199920002001200220032004200620072008200920112012201320142015201620172018201920202022202320242025
← 2019 Mercedes-Benz SL-Class Every SL-Class year 2022 Mercedes-Benz SL-Class →

2020 Mercedes-Benz SL-Class vs similar 2020 convertibles

The SL-Class has the largest tank of the five 2020 convertibles compared here, 19.8 gallons against 18.5 for the Jaguar F-TYPE.

2020 modelTankLongest highway range
Mercedes-Benz SL-Class 19.8 gal 554 mi
Jaguar F-TYPE 16.6–18.5 gal 518 mi
Porsche 911 16.9–17.6 gal 422 mi
BMW 4 Series 15.8 gal 537 mi
Audi S5 15.3 gal 413 mi

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

2020 Mercedes-Benz SL-Class fuel system recalls

NHTSA lists 1 fuel-system recall for the 2020 Mercedes-Benz SL-Class, out of 3 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 SL-Class?

The 2020 Mercedes-Benz SL-Class holds 19.8 gallons (75 liters) on every trim we list.

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

The 2020 Mercedes-Benz SL-Class tank holds 75 liters, or 19.8 gallons in US gallons.

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

About 495–554 miles on the highway and 337–396 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 SL-Class go on a quarter tank?

About 139 highway miles or 99 in town from the 19.8-gallon tank, which has roughly 5.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.

What gas does the 2020 Mercedes-Benz SL-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 SL-Class?

At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 19.8-gallon tank from empty costs $104.54. It ranges from $90.49 in the Gulf Coast to $125.93 in California.

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

About 123 pounds for the 19.8-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.

Does the 2020 Mercedes-Benz SL-Class have a bigger gas tank than the BMW 4 Series?

Yes. The 2020 Mercedes-Benz SL-Class holds up to 19.8 gallons; the 2020 BMW 4 Series holds up to 15.8.

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

Yes. NHTSA lists 1 fuel-system recall for the 2020 Mercedes-Benz SL-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-Class17.4 gallons GLC-Class Coupe17.4 gallons GLE-Class22.5 gallons