Compare 2017 Audi A8 vs 2017 Cadillac CT6 vs 2017 Mercedes-Benz S Class

2017 Audi A8
X
2017 Cadillac CT6
X
2017 Mercedes-Benz S Class
X
Select style
3.0 TFSI
Style MPG City MPG Hwy Invoice MSRP
A8 L 3.0 TFSI 19 29 $76,725 $82,500
A8 L 4.0 TFSI Sport 18 29 $85,096 $91,500
S8 plus 4.0 TFSI 15 24 $107,788 $115,900
Select style
4-Door Sedan 2.0L PLUG-IN RWD
Style MPG City MPG Hwy Invoice MSRP
CT6 4-Door Sedan 2.0L PLUG-IN RWD N/A N/A $71,340 $75,095
CT6 4-Door Sedan 2.0L Turbo Luxury RWD 22 30 $55,760 $58,695
CT6 4-Door Sedan 2.0L Turbo RWD 22 30 $51,105 $53,795
CT6 4-Door Sedan 3.0L Turbo Luxury AWD 18 26 $61,460 $64,695
CT6 4-Door Sedan 3.0L Turbo Platinum AWD 18 26 $83,405 $87,795
CT6 4-Door Sedan 3.0L Turbo Premium Luxury AWD 18 26 $64,500 $67,895
CT6 4-Door Sedan 3.6L AWD 18 27 $53,005 $55,795
CT6 4-Door Sedan 3.6L Luxury AWD 18 27 $57,660 $60,695
CT6 4-Door Sedan 3.6L Platinum AWD 18 27 $79,605 $83,795
CT6 4-Door Sedan 3.6L Premium Luxury AWD 18 27 $60,700 $63,895
Select style
AMG S 63 4MATIC Convertible
Style MPG City MPG Hwy Invoice MSRP
S-Class AMG S 63 4MATIC Convertible 14 22 $164,052 $176,400
S-Class AMG S 63 4MATIC Coupe 15 23 $153,218 $164,750
S-Class AMG S 63 4MATIC Sedan 15 23 $134,571 $144,700
S-Class AMG S 65 Convertible 14 21 $230,547 $247,900
S-Class AMG S 65 Coupe 13 21 $219,713 $236,250
S-Class AMG S 65 Sedan 13 22 $211,017 $226,900
S-Class Maybach S 550 4MATIC Sedan 16 24 $154,566 $166,200
S-Class Maybach S 600 Sedan 13 21 $177,909 $191,300
S-Class S 550 4MATIC Coupe 17 25 $114,158 $122,750
S-Class S 550 4MATIC Sedan 16 25 $92,628 $99,600
S-Class S 550 Convertible 17 25 $122,202 $131,400
S-Class S 550 Sedan 18 26 $89,838 $96,600
S-Class S 550e Plug-In Hybrid Sedan N/A N/A $89,838 $96,600
S-Class S 600 Sedan 13 22 $158,798 $170,750
Pricing
Invoice Price
$76,725
$71,340
$164,052
Manufacturer Suggested Retail Price
$82,500
$75,095
$176,400
Monthly Payment Estimate
$1375 / month
$1252 / month
$2940 / month
The Car Connection's Take
TCC Rating
8.0
8.0
8.4
TCC’s Bottom Line
The 2017 Audi S8 is the super sedan by which others are measured. The 2017 Cadillac CT6 has a spare, light appeal that runs counter to its German rivals; with a starting price in the $50,000s, it's a great value, too. The Mercedes-Benz S-Class lineup is more diverse than it's ever been and is still the benchmark by which all full-size luxury cars should be measured.
TCC Likes
TCC Dislikes
Fuel Economy
City
19 mpg 0 mpg 14 mpg
Highway
29 mpg 0 mpg 22 mpg
Vehicle
EPA Classification
Large Cars Large Cars Compact Cars
Number of Passenger Doors
- 4 -
Interior Dimensions
Second Head Room (in)
39.1 38.06 36.7
Second Shoulder Room (in)
57.8 56.2 54.1
Front Head Room (in)
37.2 40.2 40
Passenger Volume (ft³)
121.9 - TBD - -
Front Shoulder Room (in)
59.1 58.3 60.6
Second Leg Room (in)
42.9 40.4 -
Passenger Capacity
5 5 4
Front Leg Room (in)
41.4 46.4 -
Front Hip Room (in)
- 55.9 -
Second Hip Room (in)
- 53.5 -
Exterior Dimensions
Width, Max w/o mirrors (in)
76.7 74.0 75.3
Track Width, Front (in)
64.7 63.4 64.7
Length, Overall (in)
207.4 204.1 198.6
Height, Overall (in)
57.9 58.0 56.2
Track Width, Rear (in)
64.4 64.0 64.9
Wheelbase (in)
122.9 122.4 115.9
Liftover Height (in)
- - TBD - -
Min Ground Clearance (in)
- - TBD - -
Cargo Area Dimensions
Trunk Volume (ft³)
14.2 10.6 8.8
Brakes
Brake Type
4-Wheel Disc Pwr 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)
15 - TBD - 15.4
Drum - Rear (Yes or )
NA NA NA
Brake ABS System
4-Wheel 4-Wheel 4-Wheel
Disc - Rear (Yes or )
Yes Yes Yes
Rear Brake Rotor Diam x Thickness (in)
14 - TBD - 14.2
Fuel Tank
Fuel Tank Capacity, Approx (gal)
21.7 15.6 21.1
Steering
Turning Diameter - Curb to Curb (ft)
41.7 - TBD - -
Steering Type
Rack-Pinion Electric Rack & Pinion Rack-Pinion
Lock to Lock Turns (Steering)
- - TBD - -
Turning Diameter - Wall to Wall (ft)
- - TBD - -
Steering Ratio (:1), Overall
- - TBD - -
Tires
Rear Tire Size
P255/45HR19 P265/45R18 P285/35YR20
Rear Tire Order Code
NA RHI NA
Front Tire Size
P255/45HR19 P235/50R18 P255/40YR20
Spare Tire Size
Compact NA NA
Front Tire Order Code
NA RHI NA
Spare Tire Order Code
NA NA NA
Weight Information
Base Curb Weight (lbs)
4464 - TBD - 4817
Wheels
Front Wheel Material
Aluminum Aluminum Aluminum
Spare Wheel Material
Aluminum NA NA
Front Wheel Size (in)
19 X 9 18 x 8 20 X 8.5
Spare Wheel Size (in)
Compact NA NA
Rear Wheel Material
Aluminum Aluminum Aluminum
Rear Wheel Size (in)
19 X 9 18 x 8.5 20 X 9.5
Electrical
Maximum Alternator Capacity (amps)
190 - TBD - 150
Cold Cranking Amps @ 0° F (Primary)
- - TBD - 520
Engine
Engine Type
Intercooled Supercharger Premium Unleaded V-6 Turbocharged Gas/Plug-in Electric I4 Twin Turbo Premium Unleaded V-8
Fuel System
Gasoline Direct Injection Direct Injection Gasoline Direct Injection
SAE Net Torque @ RPM
325 @ 2900 295 @ 1700-5500 664 @ 2250
Engine Order Code
NA LTG NA
Displacement
3.0 L/183 2.0L/122 5.5 L/333
SAE Net Horsepower @ RPM
333 @ 5500 265 @ 5500 577 @ 5500
Mileage
EPA Fuel Economy Est - City (MPG)
19 - TBD - 14
Fuel Economy Est-Combined (MPG)
22 26 17
EPA Fuel Economy Est - Hwy (MPG)
29 - TBD - 22
Transmission
Trans Order Code
NA MRD 427
Seventh Gear Ratio (:1)
0.84 - TBD - 0.73
Fourth Gear Ratio (:1)
1.67 - TBD - 1.37
Trans Description Cont.
Automatic w/OD Continuously Variable Ratio Automatic w/OD
Sixth Gear Ratio (:1)
1.00 - TBD - 0.82
First Gear Ratio (:1)
4.71 - TBD - 4.34
Final Drive Axle Ratio (:1)
3.20 3.27 2.47
Third Gear Ratio (:1)
2.11 - TBD - 1.92
Trans Type
8 1 7
Eighth Gear Ratio (:1)
0.67 - TBD - -
Drivetrain
All Wheel Drive Rear Wheel Drive All Wheel Drive
Fifth Gear Ratio (:1)
1.28 - TBD - 1.00
Trans Description Cont. Again
NA NA NA
Reverse Ratio (:1)
3.32 - TBD - 3.42
Second Gear Ratio (:1)
3.14 - TBD - 2.89
Clutch Size (in)
- NA -
Summary
Body Style
quattro LWB Sedan Sedan 4MATIC Cabriolet
Vehicle Name
Audi A8 L Cadillac CT6 Mercedes-Benz S-Class
Suspension
Suspension Type - Rear (Cont.)
Multi-Link NA Multi-Link
Suspension Type - Front
Multi-Link Independent Multi-Link
Suspension Type - Front (Cont.)
Multi-Link NA Multi-Link
Suspension Type - Rear
Multi-Link Independent Multi-Link
Shock Absorber Diameter - Rear (mm)
- - TBD - -
Stabilizer Bar Diameter - Rear (in)
- - TBD - -
Shock Absorber Diameter - Front (mm)
- - TBD - -
Stabilizer Bar Diameter - Front (in)
- - TBD - -
Emissions
Tons/yr of CO2 Emissions @ 15K mi/year
8.1 - TBD - 10.3
Trailering
Dead Weight Hitch - Max Trailer Wt. (lbs)
- N/A -
Wt Distributing Hitch - Max Trailer Wt. (lbs)
- N/A -
Dead Weight Hitch - Max Tongue Wt. (lbs)
- N/A -
Wt Distributing Hitch - Max Tongue Wt. (lbs)
- N/A -
Cooling System
Total Cooling System Capacity (qts)
- - TBD - -

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