- Newest year: 2015
- Gas
- Two-seaters
2012-2015 Mercedes-Benz SLK-Class MPG & Fuel Cost
4 model years · 22–26 MPG combined
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 8 of 10 two-seater configurations, MY2015. Ranked against all rated configurations, not sales-weighted.
2012-2015 Mercedes-Benz SLK-Class at a glance
The 2012-2015 Mercedes-Benz SLK-Class covers 4 model years in the EPA database (16 configurations in all), rated 22–26 MPG combined. The newest model year, 2015, costs about $3,090 a year to fuel for its most efficient version, the SLK250 1.8L 4-cyl turbo RWD (26 MPG), at premium gasoline $5.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2013, 2014 and 2015.
2012-2015 Mercedes-Benz SLK-Class by model year
| Model year | Powertrains | Combined | $/yr | EPA ratings |
|---|---|---|---|---|
| 2015 | Gas | 22–26 MPG | $3,090–$3,630 | Ratings changed |
| 2014 | Gas | 22–26 MPG | $3,090–$3,630 | Ratings changed |
| 2013 | Gas | 22–26 MPG | $3,080–$3,630 | Ratings changed |
| 2012 | Gas | 22–26 MPG | $3,080–$3,620 | First year |
What the 2015 SLK250 1.8L 4-cyl turbo RWD costs to drive
Per month
$258
$3,090 a year ÷ 12
Per 25 miles
$5.15
Per 100 miles
$20.60
Five years
$15,450
5 × the yearly cost, prices held at today's level
vs the two-seater median
$930less a year
Class median $4,020 a year, MY2015
Based on 15,000 miles a year and premium gasoline $5.36/gal (U.S. average, Sep 2026).
2015 Mercedes-Benz SLK-Class MPG
Versus 2014: The most efficient configuration stays at 26 MPG. Its annual cost stays at $3,090.
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| SLK250 1.8L 4-cyl turbo RWD Automatic 7-spd (Most efficient) | 1.8L 4-cyl turbo | RWD | 23 | 32 | 26 | $3,090 |
| SLK250 1.8L 4-cyl turbo RWD Manual 6-spd | 1.8L 4-cyl turbo | RWD | 22 | 32 | 26 | $3,120 |
| SLK350 | 3.5L 6-cyl | RWD | 21 | 28 | 24 | $3,360 |
| SLK55 AMG | 5.5L 8-cyl | RWD | 19 | 28 | 22 | $3,630 |
4 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2014 Mercedes-Benz SLK-Class MPG
22–26 MPG · $3,090–$3,630/yr
Versus 2013: The most efficient configuration stays at 26 MPG. Its annual cost goes from $3,080 to $3,090, $10 more.
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| SLK250 1.8L 4-cyl turbo RWD Automatic 7-spd (Most efficient) | 1.8L 4-cyl turbo | RWD | 23 | 32 | 26 | $3,090 |
| SLK250 1.8L 4-cyl turbo RWD Manual 6-spd | 1.8L 4-cyl turbo | RWD | 22 | 32 | 26 | $3,120 |
| SLK350 | 3.5L 6-cyl | RWD | 21 | 28 | 24 | $3,360 |
| SLK55 AMG | 5.5L 8-cyl | RWD | 19 | 28 | 22 | $3,630 |
4 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2013 Mercedes-Benz SLK-Class MPG
22–26 MPG · $3,080–$3,630/yr
Versus 2012: The most efficient configuration stays at 26 MPG. Its annual cost stays at $3,080.
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| SLK250 1.8L 4-cyl turbo RWD Automatic 7-spd (Most efficient) | 1.8L 4-cyl turbo | RWD | 23 | 32 | 26 | $3,080 |
| SLK250 1.8L 4-cyl turbo RWD Manual 6-spd | 1.8L 4-cyl turbo | RWD | 22 | 32 | 26 | $3,120 |
| SLK350 | 3.5L 6-cyl | RWD | 21 | 28 | 24 | $3,360 |
| SLK55 AMG | 5.5L 8-cyl | RWD | 19 | 28 | 22 | $3,630 |
4 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2012 Mercedes-Benz SLK-Class MPG
22–26 MPG · $3,080–$3,620/yr
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| SLK250 1.8L 4-cyl turbo RWD Automatic 7-spd (Most efficient) | 1.8L 4-cyl turbo | RWD | 23 | 32 | 26 | $3,080 |
| SLK250 1.8L 4-cyl turbo RWD Manual 6-spd | 1.8L 4-cyl turbo | RWD | 22 | 32 | 26 | $3,120 |
| SLK350 | 3.5L 6-cyl | RWD | 20 | 29 | 23 | $3,510 |
| SLK55 AMG | 5.5L 8-cyl | RWD | 19 | 28 | 22 | $3,620 |
4 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the SLK250 1.8L 4-cyl turbo RWD: $3,680 in California and $2,680 in Texas, a $1,000 difference.
- California $3,680
- Washington $3,460
- New York $3,050
- Florida $2,820
- Texas $2,680
Similar cars
Closest combined MPG among MY2015 two-seater models.
Generations
Frequently asked questions
What gas mileage does the 2012-2015 Mercedes-Benz SLK-Class get?
EPA rates the 2012-2015 Mercedes-Benz SLK-Class at 22–26 MPG combined across 16 configurations and 4 model years. The most efficient version, the 2015 SLK250 1.8L 4-cyl turbo RWD, is rated 26 MPG (23 city, 32 highway).
Which years had the best MPG in the 2012-2015 Mercedes-Benz SLK-Class?
Every model year of the 2012-2015 Mercedes-Benz SLK-Class tops out at 26 MPG combined, so no year is better than another.
Did EPA ratings change during the 2012-2015 Mercedes-Benz SLK-Class?
Yes. Ratings changed in 2013, 2014 and 2015.
How does the 2012-2015 Mercedes-Benz SLK-Class compare with the previous generation?
The previous generation (2005-2011 Mercedes-Benz SLK-Class) is rated 16–21 MPG combined and costs $3,790–$5,020 a year to fuel; the 2012-2015 model is rated 22–26 MPG and costs $3,080–$3,630 a year.
How much does it cost to fuel a 2015 Mercedes-Benz SLK-Class per year?
Driving 15,000 miles a year at premium gasoline $5.36/gal (U.S. average, Sep 2026), the SLK250 1.8L 4-cyl turbo RWD costs about $3,090 a year. Across all 4 configurations the cost runs $3,090–$3,630 a year. That is a $540 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2015 Mercedes-Benz SLK-Class 100 miles?
About $20.60 per 100 miles for the SLK250 1.8L 4-cyl turbo RWD at premium gasoline $5.36/gal (U.S. average, Sep 2026), and between $20.60 and $24.20 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2015 Mercedes-Benz SLK-Class more efficient in the city or on the highway?
The SLK250 1.8L 4-cyl turbo RWD is rated 23 city and 32 highway MPG, so it is more efficient on the highway, by 9 MPG.
How does the 2015 Mercedes-Benz SLK-Class compare with other two-seater configurations?
The SLK250 1.8L 4-cyl turbo RWD costs about $3,090 a year to fuel, $930 less than the class median of $4,020, and less than 8 of 10 two-seater configurations. The comparison covers all 92 rated two-seater configurations for MY2015, not weighted by sales.
Is the 2015 Mercedes-Benz SLK-Class different from the 2014 model?
The most efficient configuration stays at 26 MPG. Its annual cost stays at $3,090. EPA lists 4 configurations for 2015 against 4 configurations for 2014. See the 2014 Mercedes-Benz SLK-Class for that year.