Compare 2018 Mercedes-Benz SLC Class vs 2018 Porsche 718 vs 2018 Porsche 911

2018 Mercedes-Benz SLC Class
X
2018 Porsche 718
X
2018 Porsche 911
X
Select style
AMG SLC 43 Roadster
Style MPG City MPG Hwy Invoice MSRP
SLC AMG SLC 43 Roadster 20 29 $57,056 $61,350
SLC SLC 300 Roadster 25 32 $45,012 $48,400
Select style
GTS Roadster
Style MPG City MPG Hwy Invoice MSRP
718 Boxster GTS Roadster 19 25 N/A $81,900
718 Boxster Roadster 21 28 N/A $57,400
718 Boxster S Roadster 20 26 N/A $69,800
718 Cayman Coupe 21 28 N/A $55,300
718 Cayman GTS Coupe 19 25 N/A $79,800
718 Cayman S Coupe 20 26 N/A $67,700
Select style
Carrera 4 Convertible
Style MPG City MPG Hwy Invoice MSRP
911 Carrera 4 Convertible 19 28 N/A $110,300
911 Carrera 4 Coupe 20 28 N/A $98,000
911 Carrera 4 GTS Convertible 18 26 N/A $139,900
911 Carrera 4 GTS Coupe 18 26 N/A $127,600
911 Carrera 4S Convertible 19 28 N/A $124,300
911 Carrera 4S Coupe 20 28 N/A $112,000
911 Carrera Convertible 20 29 N/A $103,400
911 Carrera Coupe 20 29 N/A $91,100
911 Carrera GTS Convertible 18 26 N/A $133,000
911 Carrera GTS Coupe 18 26 N/A $120,700
911 Carrera S Convertible 20 28 N/A $117,400
911 Carrera S Coupe 20 29 N/A $105,100
911 Carrera T Coupe 16 25 N/A $102,100
911 GT2 RS Coupe 15 21 N/A $293,200
911 GT3 Coupe 15 20 N/A $143,600
911 Targa 4 19 28 N/A $110,300
911 Targa 4 GTS 18 26 N/A $139,900
911 Targa 4S 19 28 N/A $124,300
911 Turbo Convertible 19 24 N/A $174,100
911 Turbo Coupe 19 24 N/A $161,800
911 Turbo S Convertible 19 24 N/A $203,000
911 Turbo S Coupe 19 24 N/A $190,700
Pricing
Invoice Price
$57,056
N/A
N/A
Manufacturer Suggested Retail Price
$61,350
$81,900
$110,300
Monthly Payment Estimate
$1023 / month
$1365 / month
$1838 / month
The Car Connection's Take
TCC Rating
7.2
8.0
7.6
TCC’s Bottom Line
The 2017 Mercedes-Benz SLC-Class dukes it out on comfort with more sporting rivals. The 2018 Porsche 718 range adds an impressive GTS variant to an already outstanding lineup. 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 19 mpg 19 mpg
Highway
29 mpg 25 mpg 28 mpg
Vehicle
EPA Classification
Two-Seaters Two-Seaters Minicompact Cars
Interior Dimensions
Front Leg Room (in)
42.5 - -
Passenger Volume (ft³)
48.8 - -
Front Head Room (in)
38 - -
Passenger Capacity
2 2 4
Front Shoulder Room (in)
52.2 - -
Exterior Dimensions
Height, Overall (in)
51.3 50.1 50.7
Track Width, Rear (in)
61.7 60.6 61.3
Wheelbase (in)
95.7 97.4 96.5
Width, Max w/o mirrors (in)
71.5 70.9 72.9
Track Width, Front (in)
61 59.6 60.7
Min Ground Clearance (in)
4.1 3.9 -
Length, Overall (in)
163.1 172.9 177.1
Cargo Area Dimensions
Trunk Volume (ft³)
6.4 9.7 -
Brakes
Rear Brake Rotor Diam x Thickness (in)
13 11.8 13
Brake Type
4-Wheel Disc 4-Wheel Disc 4-Wheel Disc
Rear Drum Diam x Width (in)
NA NA NA
Disc - Front (Yes or )
Yes Yes Yes
Front Brake Rotor Diam x Thickness (in)
14.2 13 13
Drum - Rear (Yes or )
NA NA NA
Brake ABS System
4-Wheel 4-Wheel 4-Wheel
Disc - Rear (Yes or )
Yes Yes Yes
Fuel Tank
Fuel Tank Capacity, Approx (gal)
15.9 16.9 17.9
Steering
Turning Diameter - Curb to Curb (ft)
34.5 36 36.7
Steering Type
Rack-Pinion Rack-Pinion Rack-Pinion
Tires
Rear Tire Size
P255/40YR18 P265/35ZR20 P295/35YR19
Rear Tire Order Code
NA NA NA
Front Tire Size
P235/40YR18 P235/35ZR20 P235/40YR19
Spare Tire Size
NA NA NA
Front Tire Order Code
NA NA NA
Spare Tire Order Code
NA NA NA
Weight Information
Base Curb Weight (lbs)
3541 3031 3417
Wheels
Front Wheel Material
Aluminum Aluminum Forged Aluminum
Spare Wheel Material
NA NA NA
Front Wheel Size (in)
18 X 8 20 X 8 19 X 8.5
Spare Wheel Size (in)
NA NA NA
Rear Wheel Material
Aluminum Aluminum Forged Aluminum
Rear Wheel Size (in)
18 X 9 20 X 10 19 X 11.5
Engine
SAE Net Torque @ RPM
384 @ 2000 309 @ 1950 331 @ 1700
Engine Order Code
NA NA NA
Displacement
3.0 L/183 2.5 L/152 3.0 L/182
SAE Net Horsepower @ RPM
362 @ 5500 365 @ 6500 370 @ 6500
Engine Type
Twin Turbo Premium Unleaded V-6 Intercooled Turbo Premium Unleaded H-4 Twin Turbo Premium Unleaded H-6
Fuel System
Gasoline Direct Injection Gasoline Direct Injection Gasoline Direct Injection
Mileage
Fuel Economy Est-Combined (MPG)
23 21 22
EPA Fuel Economy Est - Hwy (MPG)
29 25 28
EPA Fuel Economy Est - City (MPG)
20 19 19
Transmission
Sixth Gear Ratio (:1)
1.00 0.81 0.79
First Gear Ratio (:1)
5.35 3.31 3.91
Final Drive Axle Ratio (:1)
2.82 3.89 3.09
Third Gear Ratio (:1)
2.25 1.41 1.58
Trans Type
9 6 7
Drivetrain
Rear Wheel Drive Rear Wheel Drive All Wheel Drive
Fifth Gear Ratio (:1)
1.21 0.95 0.94
Trans Description Cont. Again
NA NA NA
Eighth Gear Ratio (:1)
0.72 - -
Reverse Ratio (:1)
4.93 3.00 3.55
Second Gear Ratio (:1)
3.24 1.95 2.29
Trans Order Code
NA 480 487
Fourth Gear Ratio (:1)
1.64 1.13 1.18
Trans Description Cont.
Automatic w/OD Manual w/OD Manual w/OD
Seventh Gear Ratio (:1)
0.86 - 0.62
Summary
Vehicle Name
Mercedes-Benz SLC Porsche 718 Boxster Porsche 911
Body Style
Roadster Convertible Cabriolet
Suspension
Suspension Type - Rear
Multi-Link Strut Multi-Link
Suspension Type - Rear (Cont.)
Multi-Link Strut Multi-Link
Suspension Type - Front
Strut Strut Strut
Suspension Type - Front (Cont.)
Strut Strut Strut
Emissions
Tons/yr of CO2 Emissions @ 15K mi/year
7.7 8.4 8.0
Electrical
Cold Cranking Amps @ 0° F (Primary)
- - 450
Maximum Alternator Capacity (amps)
- - 175

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