Car comparison

AUDI S8 (D5) 4.0 TFSI V8vsAUDI S6 (C8) 2.9 TFSI V6

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

AUDI S8 (D5)

4.0 TFSI V8

571 hp3996 ccGasolineAWDAutomaticTwin-turboSedan2020-2021
VS

AUDI S6 (C8)

2.9 TFSI V6

444 hp2894 ccGasolineAWDAutomaticTwin-turboSedan2019-2023

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

AUDI S8 (D5) 4.0 TFSI V8

  • Quickest 0-100 km/h
    3.8 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    571 hp
    426 kW
  • Highest torque
    800 Nm
    590 lb-ft
  • Best power-to-weight
    256 hp/t
    191 kW/t
    3.9 kg/hp
  • Best estimated range
    719 km
    447 mi
  • Largest trunk
    505 L
  • Best overall score
    82/100
  • Best performance score
    85/100
  • Best practicality score
    76/100

AUDI S6 (C8) 2.9 TFSI V6

  • Lightest
    2,035 kg
    4,486 lb
  • Lowest combined fuel consumption
    10.7 L/100 km
    22.0 mpg US
    26.4 mpg UK
  • Best economy score
    78/100

Specification comparison

Specification comparison
ModelAUDIS8 (D5)4.0 TFSI V8AUDIS6 (C8)2.9 TFSI V6
Power
571hp426kW
444hp331kW
Torque
800Nm590lb-ft
600Nm443lb-ft
Curb weight
2,230kg4,916lb
2,035kg4,486lb
Gross weight
2,835kg6,250lb
-
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
36.3s99% target: 262 km/h / 163 mph
Calculated
45.1s99% target: 262 km/h / 163 mph
Calculated
0-100 km/h
3.8s
4.5s
0-200 km/h
11.2s
Calculated
13.6s
Calculated
0-60 mph
3.6s
Calculated
4.3s
Calculated
Fuel consumption
11.4L/100 km20.6mpg US24.8mpg UK
10.7L/100 km22mpg US26.4mpg UK
Fuel consumption city-
13.1L/100 km18mpg US21.6mpg UK
Fuel consumption highway-
8.4L/100 km28mpg US33.6mpg UK
Quarter mile
11.6s
Calculated
12.4s
Calculated
Power-to-weight
256hp/t191kW/t116hp/1000 lb
Calculated
218hp/t163kW/t99hp/1000 lb
Calculated
Torque-to-weight
359Nm/t240lb-ft/ton
Calculated
295Nm/t197lb-ft/ton
Calculated
Estimated range
719km447mi
Calculated
682km424mi
Calculated
Displacement
3,996cc244cu in
2,894cc177cu in
Length
5,179mm204in
4,954mm195in
Width
1,945mm77in
1,886mm74in
Height
1,474mm58in
1,446mm57in
Wheelbase
2,998mm118in
2,928mm115in
Front track
1,628mm64in
1,633mm64in
Rear track
1,617mm64in
1,618mm64in
Trunk volume
505L
388L
Doors
4
4
Seats
5
5
Fuel tank
82L
73L
CO2 emissions
260g/km
-

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricAUDIS8 (D5)4.0 TFSI V8AUDIS6 (C8)2.9 TFSI V6
Acceleration checkpoints
0-60 mph
0-97 km/h
3.6 s
4.3 s
0-100 km/h
0-62 mph
3.8 s
4.5 s
0-200 km/h
0-124 mph
11.2 s
13.6 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.1 s
2.2 s
330 ft
101 m
5.2 s
5.6 s
1/8 mile
201 m
7.7 s
8.2 s
1000 ft
305 m
9.8 s
10.5 s
1/4 mile
402 m
11.6 s
12.4 s
Trap speed
1/4 mile
402 m
203 km/h
126 mph
192 km/h
119 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
571 hp
426 kW
AUDIS6 (C8)2.9 TFSI V6
444 hp
331 kW

AUDI S8 (D5) 4.0 TFSI V8 has 127 hp more than AUDI S6 (C8) 2.9 TFSI V6.

The biggest power difference is between AUDI S6 (C8) 2.9 TFSI V6 and AUDI S8 (D5) 4.0 TFSI V8: 127 hp (95 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
800 Nm
590 lb-ft
AUDIS6 (C8)2.9 TFSI V6
600 Nm
443 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
2,230 kg
4,916 lb
AUDIS6 (C8)2.9 TFSI V6
2,035 kg
4,486 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
AUDIS6 (C8)2.9 TFSI V6
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V83.8 s
AUDIS6 (C8)2.9 TFSI V64.5 s

The biggest 0-100 km/h difference is between AUDI S8 (D5) 4.0 TFSI V8 and AUDI S6 (C8) 2.9 TFSI V6: 0.7 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
11.4 L/100 km
20.6 mpg US
24.8 mpg UK
AUDIS6 (C8)2.9 TFSI V6
10.7 L/100 km
22.0 mpg US
26.4 mpg UK

The biggest fuel consumption difference is between AUDI S6 (C8) 2.9 TFSI V6 and AUDI S8 (D5) 4.0 TFSI V8: 0.7 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
256 hp/t
191 kW/t
3.9 kg/hp
AUDIS6 (C8)2.9 TFSI V6
218 hp/t
163 kW/t
4.6 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
AUDIS8 (D5)4.0 TFSI V8
719 km
447 mi
AUDIS6 (C8)2.9 TFSI V6
682 km
424 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
AUDIS8 (D5)4.0 TFSI V8
571 hp
426 kW
3.8 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
AUDIS6 (C8)2.9 TFSI V6
444 hp
331 kW
4.5 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
AUDIS8 (D5)4.0 TFSI V8
Power
571 hp
426 kW
0-100 km/h3.8 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
4 doors
5 seats
Trunk
505 L
17.8 cu ft
Length
5,179 mm
203.9 in
Height
1,474 mm
58.0 in
AUDIS6 (C8)2.9 TFSI V6
Power
444 hp
331 kW
0-100 km/h4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
4 doors
5 seats
Trunk
388 L
13.7 cu ft
Length
4,954 mm
195.0 in
Height
1,446 mm
56.9 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
AUDIS8 (D5)4.0 TFSI V8
Power
571 hp
426 kW
0-100 km/h3.8 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
11.4 L/100 km
20.6 mpg US
24.8 mpg UK
AUDIS6 (C8)2.9 TFSI V6
Power
444 hp
331 kW
0-100 km/h4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
10.7 L/100 km
22.0 mpg US
26.4 mpg UK

AUDI S8 (D5) 4.0 TFSI V8 is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
AUDIS8 (D5)4.0 TFSI V8
11.4 L/100 km
20.6 mpg US
24.8 mpg UK
3.8 s
AUDIS6 (C8)2.9 TFSI V6
10.7 L/100 km
22.0 mpg US
26.4 mpg UK
4.5 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
AUDIS8 (D5)4.0 TFSI V8
256 hp/t
191 kW/t
3.9 kg/hp
11.4 L/100 km
20.6 mpg US
24.8 mpg UK
AUDIS6 (C8)2.9 TFSI V6
218 hp/t
163 kW/t
4.6 kg/hp
10.7 L/100 km
22.0 mpg US
26.4 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleAUDIS8 (D5)4.0 TFSI V8AUDIS6 (C8)2.9 TFSI V6
Power
571 hp
426 kW
444 hp
331 kW
Torque
800 Nm
590 lb-ft
600 Nm
443 lb-ft
Acceleration
3.8 s
4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Lightness
2,230 kg
4,916 lb
2,035 kg
4,486 lb
Fuel consumption
11.4 L/100 km
20.6 mpg US
24.8 mpg UK
10.7 L/100 km
22.0 mpg US
26.4 mpg UK
Practicality
Doors/seats
4 doors
5 seats
Trunk
505 L
17.8 cu ft
Length
5,179 mm
203.9 in
Height
1,474 mm
58.0 in
Doors/seats
4 doors
5 seats
Trunk
388 L
13.7 cu ft
Length
4,954 mm
195.0 in
Height
1,446 mm
56.9 in
Range score
719 km
447 mi
682 km
424 mi
CO2 score
260 g/km
-
Trunk score
505 L
17.8 cu ft
388 L
13.7 cu ft
Power-to-weight score
256 hp/t
191 kW/t
3.9 kg/hp
218 hp/t
163 kW/t
4.6 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleAUDI S8 (D5) 4.0 TFSI V8AUDI S6 (C8) 2.9 TFSI V6
Consumption11.4 L/100 km20.6 mpg US24.8 mpg UK10.7 L/100 km22 mpg US26.4 mpg UK
Cost / 100 km19.95 LC100 km18.72 LC100 km
Cost / 100 mi32.11 LC100 mi30.13 LC100 mi
Annual fuel used1,710 L452 US gal376 UK gal1,605 L424 US gal353 UK gal
Annual fuel cost2,993 LC/year2,809 LC/year

Head-to-head comparisons

AUDI S8 (D5) 4.0 TFSI V8

  • Has 127 hp more
  • Has 200 Nm more
  • Is 0.7 s quicker from 0-100 km/h
  • Has 38 hp/t better power-to-weight
  • Has 37 km (23 mi) more estimated range
  • Has 117 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio
  • Best estimated range
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Heaviest

AUDI S6 (C8) 2.9 TFSI V6

  • Is 195 kg lighter
  • Uses 0.7 L/100 km less fuel

Pros

  • Lightest
  • Lowest combined fuel consumption

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
AUDI S8 (D5) 4.0 TFSI V8
AUDI S6 (C8) 2.9 TFSI V6
Compare selected cars
2 vehicles selected

Popular comparisons

4.0 TFSI V8
4.0 TFSI V8
VS
AUDIS8 (D5)4.0 TFSI V8vsAUDIS8 (D5)Facelift 20214.0 TFSI V8
2.9 TFSI V6
2.9 TFSI V6
VS
AUDIS6 (C8)2.9 TFSI V6vsAUDIS6 (C8)Facelift 20232.9 TFSI V6
4.0 TFSI V8
4.0 TFSI COD V8 plus
VS
AUDIS8 (D5)4.0 TFSI V8vsAUDIS8 (D4)Facelift 20134.0 TFSI COD V8 plus
2.9 TFSI V6
4.0 TFSI V8
VS
AUDIS6 (C8)2.9 TFSI V6vsAUDIS6 (C7)Facelift 20164.0 TFSI V8
4.0 TFSI V8
4.0 TFSI V8
VS
AUDIS8 (D5)4.0 TFSI V8vsAUDIS8 (D4)4.0 TFSI V8
2.9 TFSI V6
4.0 TFSI V8
VS
AUDIS6 (C8)2.9 TFSI V6vsAUDIS6 (C7)Facelift 20144.0 TFSI V8
4.0 TFSI V8
5.2 FSI V10
VS
AUDIS8 (D5)4.0 TFSI V8vsAUDIS8 (D3)Facelift 20075.2 FSI V10
2.9 TFSI V6
4.0 TFSI V8
VS
AUDIS6 (C8)2.9 TFSI V6vsAUDIS6 (C7)4.0 TFSI V8
4.0 TFSI V8
5.2 FSI V10
VS
AUDIS8 (D5)4.0 TFSI V8vsAUDIS8 (D3)5.2 FSI V10
2.9 TFSI V6
4.0 TFSI V8
VS
AUDIS6 (C8)2.9 TFSI V6vsAUDIS6 Avant (C7)Facelift 20164.0 TFSI V8
4.0 TFSI V8
4.2 V8 40V
VS
AUDIS8 (D5)4.0 TFSI V8vsAUDIS8 (D2)4.2 V8 40V
2.9 TFSI V6
4.0 TFSI V8
VS
AUDIS6 (C8)2.9 TFSI V6vsAUDIS6 Avant (C7)Facelift 20144.0 TFSI V8
AUDI S8 (D5) 4.0 TFSI V8 vs AUDI S6 (C8) 2.9 TFSI V6 - car comparison - FastVsFaster