2018 Mercedes-Benz S-Class Gas Tank Size & Fuel Capacity
Fuel tank capacity
21.1–24.6gal · 80–93 L
The 2018 Mercedes-Benz S-Class has a fuel tank capacity of 21.1 to 24.6 gallons (80–93 liters), depending on the trim. The most common size is 21.1 gallons, used on 6 trims.
A full tank is good for roughly 443–644 highway miles or 274–437 miles around town, going by the EPA ratings.
24.6 gal · Bigger than 87% of 2018 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- FAQ
2018 Mercedes-Benz S-Class fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
- no difference
- Engine
All 12 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| AMG S 63 2dr Convertible AWD 4.0L 8cyl Turbo 9A · AWD MPG 15 / 24Range 317 / 506 mi | 4.0L 8cyl Turbo 9A | AWD | 21.1 gal80 L | 15 / 24 | 317 / 506 mi | |
| AMG S 63 2dr Coupe AWD 4.0L 8cyl Turbo 9A · AWD MPG 17 / 27Range 359 / 570 mi | 4.0L 8cyl Turbo 9A | AWD | 21.1 gal80 L | 17 / 27 | 359 / 570 mi | |
| AMG S 65 2dr Convertible 6.0L 12cyl Turbo 7A · RWD MPG 14 / 21Range 295 / 443 mi | 6.0L 12cyl Turbo 7A | RWD | 21.1 gal80 L | 14 / 21 | 295 / 443 mi | |
| AMG S 65 2dr Coupe 6.0L 12cyl Turbo 7A · RWD MPG 13 / 21Range 274 / 443 mi | 6.0L 12cyl Turbo 7A | RWD | 21.1 gal80 L | 13 / 21 | 274 / 443 mi | |
| S 560 2dr Convertible 4.0L 8cyl Turbo 9A · RWD MPG 17 / 26Range 359 / 549 mi | 4.0L 8cyl Turbo 9A | RWD | 21.1 gal80 L | 17 / 26 | 359 / 549 mi | |
| S 560 4MATIC 2dr Coupe AWD 4.0L 8cyl Turbo 9A · AWD MPG 17 / 27Range 359 / 570 mi | 4.0L 8cyl Turbo 9A | AWD | 21.1 gal80 L | 17 / 27 | 359 / 570 mi | |
| S 450 4MATIC 4dr Sedan AWD 3.0L 6cyl Turbo 9A · AWD MPG 18 / 28Range 414 / 644 mi | 3.0L 6cyl Turbo 9A | AWD | 23.0 gal87 L | 18 / 28 | 414 / 644 mi | |
| S 450 4dr Sedan 3.0L 6cyl Turbo 9A · RWD MPG 19 / 28Range 437 / 644 mi | 3.0L 6cyl Turbo 9A | RWD | 23.0 gal87 L | 19 / 28 | 437 / 644 mi | |
| S 560 4MATIC 4dr Sedan AWD 4.0L 8cyl Turbo 9A · AWD MPG 17 / 27Range 391 / 621 mi | 4.0L 8cyl Turbo 9A | AWD | 23.0 gal87 L | 17 / 27 | 391 / 621 mi | |
| S 560 4dr Sedan 4.0L 8cyl Turbo 9A · RWD MPG 17 / 27Range 391 / 621 mi | 4.0L 8cyl Turbo 9A | RWD | 23.0 gal87 L | 17 / 27 | 391 / 621 mi | |
| AMG S 63 4dr Sedan AWD 4.0L 8cyl Turbo 9A · AWD MPG 17 / 26Range 418 / 640 mi | 4.0L 8cyl Turbo 9A | AWD | 24.6 gal93 L | 17 / 26 | 418 / 640 mi | |
| AMG S 65 4dr Sedan 6.0L 12cyl Turbo 7A · RWD MPG 13 / 22Range 320 / 541 mi | 6.0L 12cyl Turbo 7A | RWD | 24.6 gal93 L | 13 / 22 | 320 / 541 mi | |
| No trim matches all of these filters. | ||||||
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 2018 Mercedes-Benz S-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 21 MPG, a full 23.0-gallon tank covers about 483 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 23.0 | 621 | 391 |
| 3/4 | 17.3 | 466 | 293 |
| 1/2 | 11.5 | 311 | 196 |
| 1/4 | 5.8 | 155 | 98 |
| 1/8 | 2.9 | 78 | 49 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 714 gallons, roughly 31 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
- 16–22 MPG
- Tailpipe CO2
- 403–574 g/mi
- EPA greenhouse score
- 2–4 of 10
- Gas guzzler tax
- Yes
- Source
- EPA ratings
What it costs to fill up a 2018 Mercedes-Benz S-Class
$111.41 to fill the 21.1-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 21.1 gal | Premium | $5.28 | $111.41 | $83.56 |
| 23.0 gal | Premium | $5.28 | $121.44 | $91.08 |
| 24.6 gal | Premium | $5.28 | $129.89 | $97.42 |
By region, 21.1-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $104.02 |
| Midwest | $5.37 | $113.31 |
| Gulf CoastLowest | $4.57 | $96.43 |
| Rocky Mountain | $5.12 | $108.03 |
| West Coast | $6.08 | $128.29 |
| CaliforniaHighest | $6.36 | $134.20 |
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
- 21.1-gallon tank$111.41
- 23.0-gallon tank$121.44
- 24.6-gallon tank$129.89
- A year of driving (15,000 mi)$3,771
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
S-Class tank size in other years
The tank changed for 2018: 21.1–24.6 gal, up from 16.6–24.6 gal on the 2017 S-Class.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 S-Class | 17.2–22.1 gal | 619 mi |
| 2022 S-Class | 22.1 gal | 663 mi |
| 2021 S-Class | 21.1–22.1 gal | 641 mi |
| 2020 S-Class | 21.1–24.3 gal | 591 mi |
| 2019 S-Class | 21.1–24.3 gal | 591 mi |
| 2018 S-Class | 21.1–24.6 gal | 644 mi |
| 2017 S-Class | 16.6–24.6 gal | 598 mi |
| 2016 S-Class | 20.6–21.9 gal | 618 mi |
| 2015 S-Class | 20.6–21.9 gal | 618 mi |
| 2014 S-Class | 21.1 gal | 549 mi |
| 2013 S-Class | 21.9–23.8 gal | 679 mi |
- 2026
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2018 Mercedes-Benz S-Class vs similar 2018 sedans
The S-Class has the largest tank of the seven 2018 sedans compared here, 24.6 gallons against 23.7 for the Porsche Panamera.
| 2018 model | Tank | Longest highway range |
|---|---|---|
| Mercedes-Benz S-Class | 21.1–24.6 gal | 644 mi |
| Porsche Panamera | 21.1–23.7 gal | 664 mi |
| Genesis G90 | 21.9 gal | 526 mi |
| Jaguar XJ | 21.7 gal | 586 mi |
| BMW ALPINA B7 | 20.6 gal | 515 mi |
| Cadillac XTS | 19.0–20.0 gal | 532 mi |
| Lincoln Continental | 18.0 gal | 486 mi |
Other 2018 sedans of a similar size, one model per brand.
2018 Mercedes-Benz S-Class fuel system recalls
None of the 14 recalls NHTSA lists for the 2018 Mercedes-Benz S-Class involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2018 Mercedes-Benz S-Class?
The 2018 Mercedes-Benz S-Class holds between 21.1 and 24.6 gallons, depending on the trim. 21.1 gallons is the usual size; the 24.6-gallon tank comes on the AMG S 63 4dr Sedan AWD (4.0L 8cyl Turbo 9A).
How many gallons and liters does the 2018 Mercedes-Benz S-Class gas tank hold?
The 2018 Mercedes-Benz S-Class tank holds 80–93 liters, or 21.1–24.6 gallons in US gallons.
Which 2018 Mercedes-Benz S-Class has the biggest gas tank?
The 24.6-gallon tank is on the AMG S 63 4dr Sedan AWD, AMG S 65 4dr Sedan. The smallest tank, 21.1 gallons, is on the AMG S 63 2dr Convertible AWD.
Does AWD change the 2018 Mercedes-Benz S-Class gas tank?
No. AWD and RWD versions of the 2018 Mercedes-Benz S-Class use the same 21.1–24.6 gal tank.
How far can a 2018 Mercedes-Benz S-Class go on a full tank?
About 443–644 miles on the highway and 274–437 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 2018 Mercedes-Benz S-Class go on a quarter tank?
About 155 highway miles or 98 in town from the 23.0-gallon tank, which has roughly 5.8 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Mercedes-Benz S-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 2018 Mercedes-Benz S-Class?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 21.1-gallon tank from empty costs $111.41. It ranges from $96.43 in the Gulf Coast to $134.20 in California.
How much does a full tank of gas weigh in a 2018 Mercedes-Benz S-Class?
About 153 pounds for the 24.6-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 Mercedes-Benz S-Class have a bigger gas tank than the BMW ALPINA B7?
Yes. The 2018 Mercedes-Benz S-Class holds up to 24.6 gallons; the 2018 BMW ALPINA B7 holds up to 20.6.
Has the 2018 Mercedes-Benz S-Class had a fuel pump or fuel system recall?
No. None of the 14 recalls NHTSA lists for the 2018 Mercedes-Benz S-Class involve the fuel system.
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.