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Mercedes-Benz SL-Class vs Porsche 911

2026 Mercedes-Benz SL-Class vs 2026 Porsche 911 — two minicompact cars compared on efficiency, size, safety and reliability.

Mercedes-Benz SL-Class

2026 Mercedes-Benz SL-Class

Minicompact CarsAWD/4WDHybrid/EV
VS4 – 0Mercedes-Benz SL-Class wins 4 of 4 categories
Porsche 911

2026 Porsche 911

Minicompact CarsAWD/4WD

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The short version

The Mercedes-Benz SL-Class is more fuel-efficient: 22 vs 21 MPG combined in its best version.

That works out to about $150 a year less in fuel for the Mercedes-Benz SL-Class (EPA estimate, 15,000 miles).

Across all model years since 2005, the Mercedes-Benz SL-Class has had fewer recall campaigns (1 vs 35).

The two cars

The 2026 Mercedes-Benz SL-Class is a minicompact car offered with 2 engines (2.0L 4-cyl turbo and 4.0L 8-cyl turbo), including a hybrid version and rear-wheel drive and all-wheel drive. EPA rates its most efficient version at 22 MPG combined (19 city / 27 highway), 8% better than the 2026 minicompact car average of 20.3 MPG, for an estimated $3,750 a year in fuel.

The 2026 Porsche 911 is a minicompact car offered with 3 engines (3.0L 6-cyl turbo, 3.6L 6-cyl turbo and 4.0L 6-cyl) and rear-wheel drive and all-wheel drive. It measures about 178 inches long and 73 inches wide on a 97-inch wheelbase, with a curb weight of roughly 3,472 lb (Carrera 2dr Cabriolet).

Buying used? The 2024 SL-Class and the 2018 911 have the fewest problems in our data; avoid the 2021 911.

Basics

Minicompact Cars
Class
Minicompact Cars
Hybrid, Premium Gasoline
Fuel
Premium Gasoline
2.0L 4-cyl turbo, 4.0L 8-cyl turbo
Engines
3.0L 6-cyl turbo, 3.6L 6-cyl turbo, 4.0L 6-cyl
Rear-Wheel Drive, All-Wheel Drive
Drivetrain
Rear-Wheel Drive, All-Wheel Drive

Efficiency

22 MPG
Best combined MPG
21 MPG
19 city
City / highway MPG (best)
18 city
$3,750
Fuel cost per year (EPA)
$3,900

Performance & space

–
Horsepower (most powerful)
502 hp
–
Seats (most)
2
–
Length
178 in
–
Width
72.8 in
–
Height
51.2 in
–
Curb weight (lightest)
3,318 lb

Safety & reliability

–
Driver-assist features standard
9
0
Recalls (2026)
0
1
Recalls, all years since 2005
35
0
Owner complaints (latest year)
1

Interest

15,394
Wikipedia views, 30 days
41,345

Buying used

2024
Best used year
2018
–
Year to avoid
2021

Green = clearly better. Prices are not included. How we calculate this →

Which one should you choose?

Choose the Mercedes-Benz SL-Class if…

  • You want a hybrid or electric option
  • You put reliability history first (1 vs 35 recalls since 2005)

Choose the Porsche 911 if…

It doesn't clearly beat the Mercedes-Benz SL-Class on any measure we track.

Pros & cons of each

2026 Mercedes-Benz SL-Class

  • Hybrid version availableOffered as a hybrid as well as gas.
  • AWD / 4WD available
  • Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.

2026 Porsche 911

  • AWD / 4WD available
  • Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.

Full 2026 Mercedes-Benz SL-Class specs →Full 2026 Porsche 911 specs →Compare fuel costs for your driving →Compare size & garage fit →