2018 Mercedes-Benz SLC-Class Gas Tank Size & Fuel Capacity
Fuel tank capacity
15.9–18.5gal · 60–70 L
The 2018 Mercedes-Benz SLC-Class has a fuel tank capacity of 15.9 to 18.5 gallons (60–70 liters), depending on the trim. The most common size is 18.5 gallons, used on 1 trim.
A full tank is good for roughly 509–537 highway miles or 370–398 miles around town, going by the EPA ratings.
18.5 gal · Bigger than 53% 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 SLC-Class fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
All 2 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| SLC 300 2dr Convertible 2.0L 4cyl Turbo 9A · RWD MPG 25 / 32Range 398 / 509 mi | 2.0L 4cyl Turbo 9A | RWD | 15.9 gal60 L | 25 / 32 | 398 / 509 mi | |
| AMG SLC 43 2dr Convertible 3.0L 6cyl Turbo 9A · RWD MPG 20 / 29Range 370 / 537 mi | 3.0L 6cyl Turbo 9A | RWD | 18.5 gal70 L | 20 / 29 | 370 / 537 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 SLC-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 23 MPG, a full 18.5-gallon tank covers about 426 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.5 | 537 | 370 |
| 3/4 | 13.9 | 402 | 278 |
| 1/2 | 9.3 | 268 | 185 |
| 1/4 | 4.6 | 134 | 93 |
| 1/8 | 2.3 | 67 | 46 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 652 gallons, roughly 35 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
- 23–27 MPG
- Tailpipe CO2
- 324–379 g/mi
- EPA greenhouse score
- 5–6 of 10
- Source
- EPA ratings
What it costs to fill up a 2018 Mercedes-Benz SLC-Class
$97.68 to fill the 18.5-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 |
|---|---|---|---|---|
| 15.9 gal | Premium | $5.28 | $83.95 | $62.96 |
| 18.5 gal | Premium | $5.28 | $97.68 | $73.26 |
By region, 18.5-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $91.20 |
| Midwest | $5.37 | $99.34 |
| Gulf CoastLowest | $4.57 | $84.55 |
| Rocky Mountain | $5.12 | $94.72 |
| West Coast | $6.08 | $112.48 |
| CaliforniaHighest | $6.36 | $117.66 |
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
- 15.9-gallon tank$83.95
- 18.5-gallon tank$97.68
- A year of driving (15,000 mi)$3,443
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
SLC-Class tank size in other years
The 2018 SLC-Class uses the same 15.9–18.5 gal tank sizes as the 2017 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2020 SLC-Class | 15.9 gal | 509 mi |
| 2019 SLC-Class | 15.9 gal | 509 mi |
| 2018 SLC-Class | 15.9–18.5 gal | 537 mi |
| 2017 SLC-Class | 15.9–18.5 gal | 537 mi |
2018 Mercedes-Benz SLC-Class vs similar 2018 convertibles
The SLC-Class has the largest tank of the two 2018 convertibles compared here, 18.5 gallons against 14.5 for the Audi TT.
| 2018 model | Tank | Longest highway range |
|---|---|---|
| Mercedes-Benz SLC-Class | 15.9–18.5 gal | 537 mi |
| Audi TT | 14.5 gal | 435 mi |
Other 2018 convertibles of a similar size, one model per brand.
2018 Mercedes-Benz SLC-Class fuel system recalls
None of the 1 recall NHTSA lists for the 2018 Mercedes-Benz SLC-Class involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2018 Mercedes-Benz SLC-Class?
The 2018 Mercedes-Benz SLC-Class holds between 15.9 and 18.5 gallons, depending on the trim. 18.5 gallons is the usual size; the smaller 15.9-gallon tank is on the SLC 300 2dr Convertible.
How many gallons and liters does the 2018 Mercedes-Benz SLC-Class gas tank hold?
The 2018 Mercedes-Benz SLC-Class tank holds 60–70 liters, or 15.9–18.5 gallons in US gallons.
Which 2018 Mercedes-Benz SLC-Class has the biggest gas tank?
The 18.5-gallon tank is on the AMG SLC 43 2dr Convertible. The smallest tank, 15.9 gallons, is on the SLC 300 2dr Convertible.
How far can a 2018 Mercedes-Benz SLC-Class go on a full tank?
About 509–537 miles on the highway and 370–398 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 SLC-Class go on a quarter tank?
About 134 highway miles or 93 in town from the 18.5-gallon tank, which has roughly 4.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Mercedes-Benz SLC-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 SLC-Class?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 18.5-gallon tank from empty costs $97.68. It ranges from $84.55 in the Gulf Coast to $117.66 in California.
How much does a full tank of gas weigh in a 2018 Mercedes-Benz SLC-Class?
About 115 pounds for the 18.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 Mercedes-Benz SLC-Class have a bigger gas tank than the Audi TT?
Yes. The 2018 Mercedes-Benz SLC-Class holds up to 18.5 gallons; the 2018 Audi TT holds up to 14.5.
Has the 2018 Mercedes-Benz SLC-Class had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2018 Mercedes-Benz SLC-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.