2017 Mercedes-Benz CLS-Class Gas Tank Size & Fuel Capacity
Fuel tank capacity
21.1gal · 80 L
The 2017 Mercedes-Benz CLS-Class has a fuel tank capacity of 21.1 gallons (80 liters) on every trim.
A full tank is good for roughly 464–633 highway miles or 338–422 miles around town, going by the EPA ratings.
21.1 gal · Bigger than 73% of 2017 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- FAQ
2017 Mercedes-Benz CLS-Class fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
- no difference
- Engine
- no difference
All 5 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| AMG CLS 63 S 4dr Sedan AWD 5.5L 8cyl Turbo 7A · AWD MPG 16 / 22Range 338 / 464 mi | 5.5L 8cyl Turbo 7A | AWD | 21.1 gal80 L | 16 / 22 | 338 / 464 mi | |
| CLS 400 4MATIC 4dr Sedan AWD 3.0L 6cyl Turbo 9A · AWD MPG 19 / 26Range 401 / 549 mi | 3.0L 6cyl Turbo 9A | AWD | 21.1 gal80 L | 19 / 26 | 401 / 549 mi | |
| CLS 400 4dr Sedan 3.0L 6cyl Turbo 9A · RWD MPG 20 / 30Range 422 / 633 mi | 3.0L 6cyl Turbo 9A | RWD | 21.1 gal80 L | 20 / 30 | 422 / 633 mi | |
| CLS 550 4MATIC 4dr Sedan AWD 4.7L 8cyl Turbo 9A · AWD MPG 17 / 25Range 359 / 528 mi | 4.7L 8cyl Turbo 9A | AWD | 21.1 gal80 L | 17 / 25 | 359 / 528 mi | |
| CLS 550 4dr Sedan 4.7L 8cyl Turbo 9A · RWD MPG 18 / 26Range 380 / 549 mi | 4.7L 8cyl Turbo 9A | RWD | 21.1 gal80 L | 18 / 26 | 380 / 549 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 2017 Mercedes-Benz CLS-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 21.1-gallon tank covers about 464 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 21.1 | 549 | 401 |
| 3/4 | 15.8 | 411 | 301 |
| 1/2 | 10.6 | 274 | 200 |
| 1/4 | 5.3 | 137 | 100 |
| 1/8 | 2.6 | 69 | 50 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 682 gallons, roughly 32 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
- 18–21 MPG
- Tailpipe CO2
- 425–495 g/mi
- EPA greenhouse score
- 3–4 of 10
- Source
- EPA ratings
What it costs to fill up a 2017 Mercedes-Benz CLS-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 |
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
- 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.
CLS-Class tank size in other years
The 2017 CLS-Class uses the same 21.1 gal tank as every CLS-Class since 2006.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2022 CLS-Class | 21.1 gal | 633 mi |
| 2021 CLS-Class | 21.1 gal | 633 mi |
| 2020 CLS-Class | 21.1 gal | 654 mi |
| 2019 CLS-Class | 21.1 gal | 654 mi |
| 2018 CLS-Class | 21.1 gal | 549 mi |
| 2017 CLS-Class | 21.1 gal | 633 mi |
| 2016 CLS-Class | 21.1 gal | 633 mi |
| 2015 CLS-Class | 21.1 gal | 633 mi |
| 2014 CLS-Class | 21.1 gal | 528 mi |
| 2013 CLS-Class | 21.1 gal | 528 mi |
| 2012 CLS-Class | 21.1 gal | 528 mi |
2017 Mercedes-Benz CLS-Class vs similar 2017 sedans
The CLS-Class has the largest tank of the seven 2017 sedans compared here, 21.1 gallons against 20.0 for the INFINITI Q70.
| 2017 model | Tank | Longest highway range |
|---|---|---|
| Mercedes-Benz CLS-Class | 21.1 gal | 633 mi |
| INFINITI Q70 | 17.8–20.0 gal | 587 mi |
| Audi A7 | 19.8 gal | 574 mi |
| Cadillac CTS-V | 19.0 gal | 399 mi |
| Acura RLX | 15.1–18.5 gal | 555 mi |
| Lexus GS 450h | 17.4 gal | 592 mi |
| Volvo S90 | 14.5–15.9 gal | 493 mi |
Other 2017 sedans of a similar size, one model per brand.
2017 Mercedes-Benz CLS-Class fuel system recalls
None of the 1 recall NHTSA lists for the 2017 Mercedes-Benz CLS-Class involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2017 Mercedes-Benz CLS-Class?
The 2017 Mercedes-Benz CLS-Class holds 21.1 gallons (80 liters) on every trim we list.
How many gallons and liters does the 2017 Mercedes-Benz CLS-Class gas tank hold?
The 2017 Mercedes-Benz CLS-Class tank holds 80 liters, or 21.1 gallons in US gallons.
Does AWD change the 2017 Mercedes-Benz CLS-Class gas tank?
No. AWD and RWD versions of the 2017 Mercedes-Benz CLS-Class use the same 21.1 gal tank.
How far can a 2017 Mercedes-Benz CLS-Class go on a full tank?
About 464–633 miles on the highway and 338–422 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 2017 Mercedes-Benz CLS-Class go on a quarter tank?
About 137 highway miles or 100 in town from the 21.1-gallon tank, which has roughly 5.3 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2017 Mercedes-Benz CLS-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 2017 Mercedes-Benz CLS-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 2017 Mercedes-Benz CLS-Class?
About 131 pounds for the 21.1-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2017 Mercedes-Benz CLS-Class have a bigger gas tank than the Volvo S90?
Yes. The 2017 Mercedes-Benz CLS-Class holds up to 21.1 gallons; the 2017 Volvo S90 holds up to 15.9.
Has the 2017 Mercedes-Benz CLS-Class had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2017 Mercedes-Benz CLS-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.