VS
At a Glance
Power
416hp @ 6750
388hp @ 6500
Torque
369lb-ft @ 3000
332lb-ft @ 1950
Fuel
24 mpg est.
22 mpg est.
Engine
2.0 L/121ci
3.0 L/182ci
Choosing between the Mercedes-Benz Sl Class and the Porsche 911 is one of the most common decisions car buyers in the United States face. The Mercedes-Benz Sl Class delivers 416hp @ 6750 while the Porsche 911 produces 388hp @ 6500. On fuel, the Sl Class returns 24 mpg est. while the 911 uses 22 mpg est. — important in a market where fuel prices change monthly. Pricing starts at $112,550 for the Sl Class and $149,400 for the 911. Both vehicles have their merits. The right choice depends on your priorities: fuel economy, performance, towing ability, safety features or total cost of ownership. This comparison covers every specification available so you can make an informed decision.
Specification
Mercedes-Benz Sl ClassAMG SL 43 Roadster 2026 - From $112,550
Porsche 911Carrera Cabriolet 2026 - From $149,400
Performance
Power Output (hp)
416hp @ 6750
388hp @ 6500
Torque (lb-ft)
369lb-ft @ 3000
332lb-ft @ 1950
Engine & Drivetrain
Engine Capacity
2.0 L/121ci
3.0 L/182ci
Engine Layout
—
Flat/Boxer
Cylinders
4
6
Fuel Type
—
Gasoline
Forced Induction Device
Turbocharged
Turbocharged
Transmission
Automatic
Automatic
Number of Gears
—
8
Drive Wheels
Rear Wheel Drive
Rear Wheel Drive
Fuel Economy
Fuel Economy (Combined, est.)
24 mpg est.
22 mpg est.
Fuel Economy - City (mpg)
20 (2025)mpg
18 (Est)mpg
Fuel Economy - Highway (mpg)
27 (2025)mpg
25 (Est)mpg
Fuel Tank Capacity (gal)
18.5gal
16.6gal
Dimensions
Length (in)
185.2in
178.8in
Width (in)
75.4in
72.9in
Height (in)
53.5in
51.2in
Wheelbase (in)
106.3in
96.5in
Curb Weight (lbs)
3825lbs
3525lbs
Safety
ABS
✓ Standard
✓ Standard
Brake Assist
✓ Standard
✓ Standard
Stability Control
✓ Standard
✓ Standard
Traction Control
✓ Standard
✓ Standard
Driver Airbag
✓ Standard
✓ Standard
Passenger Airbag
✓ Standard
✓ Standard
Side Airbags Front
✓ Standard
✓ Standard
Curtain Airbags
✓ Standard
✓ Standard
Features & Tech
Air Conditioning
✓ Standard
✓ Standard
Climate Control
✓ Standard
✓ Standard
Cruise Control
✓ Standard
✓ Standard
Adaptive Cruise Control
✓ Standard
✓ Standard
Bluetooth
✓ Standard
✓ Standard
Backup Camera
✓ Standard
✓ Standard
Rear Parking Aid
✓ Standard
✓ Standard
Heated Seats
✓ Standard
✓ Standard
Power Seat Adjustment
✓ Standard
✓ Standard
Keyless Entry
✓ Standard
✓ Standard
Alloy Wheels
✓ Standard
✓ Standard
The Verdict
Which Wins?
Overall Winner
Mercedes-Benz Sl Class
3 / 4 categories
Performance
Sl Class
Fuel Economy
Sl Class
Value
Sl Class
Practicality
Tied
Pros & Cons
Mercedes-Benz Sl Class
Better fuel economy (24 mpg est.)
Lower starting price ($112,550)
Few notable weaknesses
Porsche 911
Well-rounded specification
Higher fuel consumption (22 mpg est.)
Higher starting price
Frequently Asked Questions
Which is more fuel efficient, the Sl Class or 911?
The Sl Class gets 24 mpg est. and the 911 gets 22 mpg est. on the combined cycle. The Sl Class is the more fuel-efficient choice. In real-world conditions with a mix of highway and urban driving, actual figures will be slightly higher.
Which has more power, the Sl Class or 911?
The Sl Class produces 416hp @ 6750 and 369lb-ft @ 3000 of torque while the 911 delivers 388hp @ 6500 and 332lb-ft @ 1950 of torque. The Sl Class is the more powerful option.
What is the price difference between the Sl Class and 911?
The Sl Class starts from $112,550 and the 911 from $149,400. The Sl Class is cheaper by $36,850 at this variant level. Final on-the-road pricing varies by dealer and specification.
Should I buy the Sl Class or the 911?
It depends on your priorities. If fuel economy matters most, check the mpg figures above. If you need towing capacity, compare the towing ratings. For day-to-day driving - commutes, school runs and highway trips - consider ground clearance, service network coverage, and total cost of ownership including insurance and maintenance. Use the spec tables above to compare every detail before making your decision.
Also Consider