Compare 2018 Mercedes-Benz SL Class vs 2018 Porsche 911

2018 Mercedes-Benz SL Class
2018 Porsche 911
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Roadster SL 450
Style MPG City MPG Hwy Invoice MSRP
Roadster SL 450 20 28 $82,026 $88,200
Roadster SL 550 17 25 $104,439 $112,300
Roadster AMG SL 63 16 25 $142,151 $152,850
Roadster AMG SL 65 13 22 $206,460 $222,000
Select style
Coupe Carrera
Style MPG City MPG Hwy Invoice MSRP
Coupe Carrera 20 29 N/A $91,100
Coupe Carrera 4 20 28 N/A $98,000
Coupe Carrera T 16 25 N/A $102,100
Cabriolet Carrera 20 29 N/A $103,400
Coupe Carrera S 20 29 N/A $105,100
Cabriolet Carrera 4 19 28 N/A $110,300
Targa 4 19 28 N/A $110,300
Coupe Carrera 4S 20 28 N/A $112,000
Cabriolet Carrera S 20 28 N/A $117,400
Coupe Carrera GTS 18 26 N/A $120,700
Cabriolet Carrera 4S 19 28 N/A $124,300
Targa 4S 19 28 N/A $124,300
Coupe Carrera 4 GTS 18 26 N/A $127,600
Cabriolet Carrera GTS 18 26 N/A $133,000
Cabriolet Carrera 4 GTS 18 26 N/A $139,900
Targa 4 GTS 18 26 N/A $139,900
Coupe GT3 15 20 N/A $143,600
Coupe Turbo 19 24 N/A $161,800
Cabriolet Turbo 19 24 N/A $174,100
Coupe Turbo S 19 24 N/A $190,700
Cabriolet Turbo S 19 24 N/A $203,000
Coupe GT2 RS 15 21 N/A $293,200
Pricing
Invoice Price
$82,026
N/A
Manufacturer Suggested Retail Price
$88,200
$91,100
Monthly Payment Estimate
$1470 / month
$1518 / month
The Car Connection's Take
TCC Rating
7.6
7.6
TCC’s Bottom Line
The 2018 Mercedes-Benz SL-Class represents the pinnacle of droptop grand touring cruisers. But what does that mean anymore? The 2018 Porsche 911 is a superlative sports car that has defied its age. It’s a classic, but performs better than nearly any newcomer to its arena.
TCC Likes
TCC Dislikes
Fuel Economy
City
20 mpg 20 mpg
Highway
28 mpg 29 mpg
Vehicle
EPA Classification
Two-Seaters Minicompact Cars
Interior Dimensions
Front Leg Room (in)
42.9 -
Passenger Volume (ft³)
50.5 -
Front Hip Room (in)
53.6 -
Front Head Room (in)
39.1 -
Passenger Capacity
2 4
Front Shoulder Room (in)
55.5 -
Exterior Dimensions
Track Width, Rear (in)
63 59.8
Wheelbase (in)
101.7 96.5
Width, Max w/o mirrors (in)
73.9 71.2
Track Width, Front (in)
62.8 60.7
Length, Overall (in)
182.3 177.1
Height, Overall (in)
51.2 50.9
Cargo Area Dimensions
Trunk Volume (ft³)
8.5 -
Brakes
Brake ABS System
4-Wheel 4-Wheel
Disc - Rear (Yes or )
Yes Yes
Rear Brake Rotor Diam x Thickness (in)
12.6 13
Brake Type
4-Wheel Disc 4-Wheel Disc
Rear Drum Diam x Width (in)
NA NA
Disc - Front (Yes or )
Yes Yes
Front Brake Rotor Diam x Thickness (in)
14.2 13
Drum - Rear (Yes or )
NA NA
Fuel Tank
Fuel Tank Capacity, Approx (gal)
19.8 16.9
Steering
Steering Type
Rack-Pinion Rack-Pinion
Turning Diameter - Curb to Curb (ft)
36.2 36.7
Tires
Spare Tire Size
NA NA
Front Tire Order Code
NA NA
Spare Tire Order Code
NA NA
Rear Tire Size
P285/30YR19 P295/35YR19
Rear Tire Order Code
NA NA
Front Tire Size
P255/35YR19 P235/40YR19
Weight Information
Base Curb Weight (lbs)
3826 3153
Wheels
Rear Wheel Material
Aluminum Forged Aluminum
Rear Wheel Size (in)
19 X 9.5 19 X 11.5
Front Wheel Material
Aluminum Forged Aluminum
Spare Wheel Material
NA NA
Front Wheel Size (in)
19 X 8.5 19 X 8.5
Spare Wheel Size (in)
NA NA
Engine
Engine Type
Twin Turbo Premium Unleaded V-6 Twin Turbo Premium Unleaded H-6
Fuel System
Gasoline Direct Injection Gasoline Direct Injection
SAE Net Torque @ RPM
369 @ 2000 331 @ 1700
Engine Order Code
NA NA
Displacement
3.0 L/183 3.0 L/182
SAE Net Horsepower @ RPM
362 @ 5500 370 @ 6500
Mileage
EPA Fuel Economy Est - City (MPG)
20 20
Fuel Economy Est-Combined (MPG)
23 23
EPA Fuel Economy Est - Hwy (MPG)
28 29
Transmission
Trans Order Code
421 487
Fourth Gear Ratio (:1)
1.64 1.18
Trans Description Cont.
Automatic w/OD Manual w/OD
Seventh Gear Ratio (:1)
0.86 0.62
Sixth Gear Ratio (:1)
1.00 0.79
First Gear Ratio (:1)
5.35 3.91
Final Drive Axle Ratio (:1)
3.07 3.09
Third Gear Ratio (:1)
2.25 1.58
Trans Type
9 7
Drivetrain
Rear Wheel Drive Rear Wheel Drive
Fifth Gear Ratio (:1)
1.21 0.94
Trans Description Cont. Again
NA NA
Eighth Gear Ratio (:1)
0.72 -
Reverse Ratio (:1)
4.80 3.55
Second Gear Ratio (:1)
3.24 2.29
Summary
Body Style
Roadster Coupe
Vehicle Name
Mercedes-Benz SL Porsche 911
Suspension
Suspension Type - Rear
Multi-Link Multi-Link
Suspension Type - Rear (Cont.)
Multi-Link Multi-Link
Suspension Type - Front
Multi-Link Strut
Suspension Type - Front (Cont.)
Multi-Link Strut
Emissions
Tons/yr of CO2 Emissions @ 15K mi/year
7.6 7.7
Electrical
Cold Cranking Amps @ 0° F (Primary)
- 450
Maximum Alternator Capacity (amps)
- 175

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