Car comparison

Mercedes-Benz R-class (W251) R 500 V8vsAUDI A6 allroad (4F/C6) 4.2 FSI V8

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

New comparison

Mercedes-Benz R-class (W251)

R 500 V8

388 hp5461 ccGasolineAWDAutomaticNaturally aspiratedWagon / estate2007-2009
VS

AUDI A6 allroad (4F/C6)

4.2 FSI V8

350 hp4163 ccGasolineAWDAutomaticNaturally aspiratedWagon / estate2006-2008

Comparison overview

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

Best choices

AUDI A6 allroad (4F/C6) 4.2 FSI V8

  • Lightest
    1,880 kg
    4,145 lb
  • Best power-to-weight
    186 hp/t
    139 kW/t
    5.4 kg/hp
  • Lowest combined fuel consumption
    11.2 L/100 km
    21.0 mpg US
    25.2 mpg UK
  • Lowest city consumption
    15.7 L/100 km
    15.0 mpg US
    18.0 mpg UK
  • Lowest highway consumption
    8.6 L/100 km
    27.4 mpg US
    32.8 mpg UK
  • Best estimated range
    714 km
    444 mi
  • Largest trunk
    565 L
  • Best economy score
    77/100
  • Best practicality score
    87/100

Mercedes-Benz R-class (W251) R 500 V8

  • Quickest 0-100 km/h
    6.1 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    388 hp
    289 kW
  • Highest torque
    530 Nm
    391 lb-ft
  • Best overall score
    72/100
  • Best performance score
    68/100

Specification comparison

Specification comparison
ModelMercedes-BenzR-class (W251)R 500 V8AUDIA6 allroad (4F/C6)4.2 FSI V8
Power
388hp289kW
350hp261kW
Torque
530Nm391lb-ft
440Nm325lb-ft
Curb weight
2,145kg4,729lb
1,880kg4,145lb
Gross weight
2,880kg6,349lb
2,510kg5,534lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
72.3s99% target: 257 km/h / 160 mph
Calculated
71.4s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
6.1s
6.3s
0-200 km/h
20.6s
Calculated
20.8s
Calculated
0-60 mph
5.8s
Calculated
6.0s
Calculated
Fuel consumption
13.4L/100 km17.6mpg US21.1mpg UK
11.2L/100 km21mpg US25.2mpg UK
Fuel consumption city
18.8L/100 km12.5mpg US15.0mpg UK
15.7L/100 km15mpg US18.0mpg UK
Fuel consumption highway
10.2L/100 km23.1mpg US27.7mpg UK
8.6L/100 km27.4mpg US32.8mpg UK
Quarter mile
14.1s
Calculated
14.3s
Calculated
Power-to-weight
181hp/t135kW/t82hp/1000 lb
Calculated
186hp/t139kW/t84hp/1000 lb
Calculated
Torque-to-weight
247Nm/t165lb-ft/ton
Calculated
234Nm/t157lb-ft/ton
Calculated
Estimated range
597km371mi
Calculated
714km444mi
Calculated
Displacement
5,461cc333cu in
4,163cc254cu in
Length
4,938mm194in
4,934mm194in
Width
1,922mm76in
1,862mm73in
Height
1,661mm65in
1,519mm60in
Wheelbase
2,980mm117in
2,833mm112in
Front track
1,643mm65in
1,596mm63in
Rear track
1,636mm64in
1,587mm62in
Trunk volume
324L
565L
Max trunk volume
2,001L
1,660L
Doors
5
5
Seats
5
5
Fuel tank
80L
80L

Performance charts

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

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

Mercedes-Benz R-class (W251) R 500 V8AUDI A6 allroad (4F/C6) 4.2 FSI V8PowerTorque
  • Mercedes-Benz R-class (W251) R 500 V8: Power / Torque
  • AUDI A6 allroad (4F/C6) 4.2 FSI V8: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Mercedes-BenzR-class (W251)R 500 V86,000 rpm2,800-4,800 rpm6,250 rpm
AUDIA6 allroad (4F/C6)4.2 FSI V86,800 rpm3,500 rpm7,050 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricMercedes-BenzR-class (W251)R 500 V8AUDIA6 allroad (4F/C6)4.2 FSI V8
Acceleration checkpoints
0-60 mph
0-97 km/h
5.8 s
6.0 s
0-100 km/h
0-62 mph
6.1 s
6.3 s
0-200 km/h
0-124 mph
20.6 s
20.8 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.4 s
2.5 s
330 ft
101 m
6.3 s
6.4 s
1/8 mile
201 m
9.3 s
9.5 s
1000 ft
305 m
11.9 s
12.1 s
1/4 mile
402 m
14.1 s
14.3 s
Trap speed
1/4 mile
402 m
168 km/h
105 mph
168 km/h
104 mph

Power comparison

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

Chart data table
VehicleValue
Mercedes-BenzR-class (W251)R 500 V8
388 hp
289 kW
AUDIA6 allroad (4F/C6)4.2 FSI V8
350 hp
261 kW

Mercedes-Benz R-class (W251) R 500 V8 has 38 hp more than AUDI A6 allroad (4F/C6) 4.2 FSI V8.

The biggest power difference is between AUDI A6 allroad (4F/C6) 4.2 FSI V8 and Mercedes-Benz R-class (W251) R 500 V8: 38 hp (28 kW).

Torque comparison

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

Chart data table
VehicleValue
Mercedes-BenzR-class (W251)R 500 V8
530 Nm
391 lb-ft
AUDIA6 allroad (4F/C6)4.2 FSI V8
440 Nm
325 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Mercedes-BenzR-class (W251)R 500 V8
2,145 kg
4,729 lb
AUDIA6 allroad (4F/C6)4.2 FSI V8
1,880 kg
4,145 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
Mercedes-BenzR-class (W251)R 500 V8
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
AUDIA6 allroad (4F/C6)4.2 FSI V8
Unrestricted
260 km/h162 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
Mercedes-BenzR-class (W251)R 500 V86.1 s
AUDIA6 allroad (4F/C6)4.2 FSI V86.3 s

The biggest 0-100 km/h difference is between Mercedes-Benz R-class (W251) R 500 V8 and AUDI A6 allroad (4F/C6) 4.2 FSI V8: 0.2 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
Mercedes-BenzR-class (W251)R 500 V8
13.4 L/100 km
17.6 mpg US
21.1 mpg UK
AUDIA6 allroad (4F/C6)4.2 FSI V8
11.2 L/100 km
21.0 mpg US
25.2 mpg UK

The biggest fuel consumption difference is between AUDI A6 allroad (4F/C6) 4.2 FSI V8 and Mercedes-Benz R-class (W251) R 500 V8: 2.2 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
Mercedes-BenzR-class (W251)R 500 V8
181 hp/t
135 kW/t
5.5 kg/hp
AUDIA6 allroad (4F/C6)4.2 FSI V8
186 hp/t
139 kW/t
5.4 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Mercedes-BenzR-class (W251)R 500 V8
597 km
371 mi
AUDIA6 allroad (4F/C6)4.2 FSI V8
714 km
444 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Mercedes-BenzR-class (W251)R 500 V8
388 hp
289 kW
6.1 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
AUDIA6 allroad (4F/C6)4.2 FSI V8
350 hp
261 kW
6.3 s
Unrestricted
260 km/h162 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
Mercedes-BenzR-class (W251)R 500 V8
Power
388 hp
289 kW
0-100 km/h6.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
5 doors
5 seats
Trunk
324 L
11.4 cu ft
Length
4,938 mm
194.4 in
Height
1,661 mm
65.4 in
AUDIA6 allroad (4F/C6)4.2 FSI V8
Power
350 hp
261 kW
0-100 km/h6.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
5 doors
5 seats
Trunk
565 L
20.0 cu ft
Length
4,934 mm
194.3 in
Height
1,519 mm
59.8 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
Mercedes-BenzR-class (W251)R 500 V8
Power
388 hp
289 kW
0-100 km/h6.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
13.4 L/100 km
17.6 mpg US
21.1 mpg UK
AUDIA6 allroad (4F/C6)4.2 FSI V8
Power
350 hp
261 kW
0-100 km/h6.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
11.2 L/100 km
21.0 mpg US
25.2 mpg UK

AUDI A6 allroad (4F/C6) 4.2 FSI 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
Mercedes-BenzR-class (W251)R 500 V8
13.4 L/100 km
17.6 mpg US
21.1 mpg UK
6.1 s
AUDIA6 allroad (4F/C6)4.2 FSI V8
11.2 L/100 km
21.0 mpg US
25.2 mpg UK
6.3 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
Mercedes-BenzR-class (W251)R 500 V8
181 hp/t
135 kW/t
5.5 kg/hp
13.4 L/100 km
17.6 mpg US
21.1 mpg UK
AUDIA6 allroad (4F/C6)4.2 FSI V8
186 hp/t
139 kW/t
5.4 kg/hp
11.2 L/100 km
21.0 mpg US
25.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleMercedes-BenzR-class (W251)R 500 V8AUDIA6 allroad (4F/C6)4.2 FSI V8
Power
388 hp
289 kW
350 hp
261 kW
Torque
530 Nm
391 lb-ft
440 Nm
325 lb-ft
Acceleration
6.1 s
6.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
2,145 kg
4,729 lb
1,880 kg
4,145 lb
Fuel consumption
13.4 L/100 km
17.6 mpg US
21.1 mpg UK
11.2 L/100 km
21.0 mpg US
25.2 mpg UK
Practicality
Doors/seats
5 doors
5 seats
Trunk
324 L
11.4 cu ft
Length
4,938 mm
194.4 in
Height
1,661 mm
65.4 in
Doors/seats
5 doors
5 seats
Trunk
565 L
20.0 cu ft
Length
4,934 mm
194.3 in
Height
1,519 mm
59.8 in
Range score
597 km
371 mi
714 km
444 mi
Trunk score
324 L
11.4 cu ft
565 L
20.0 cu ft
Power-to-weight score
181 hp/t
135 kW/t
5.5 kg/hp
186 hp/t
139 kW/t
5.4 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
VehicleMercedes-Benz R-class (W251) R 500 V8AUDI A6 allroad (4F/C6) 4.2 FSI V8
Consumption13.4 L/100 km17.6 mpg US21.1 mpg UK11.2 L/100 km21 mpg US25.2 mpg UK
Cost / 100 km23.45 LC100 km19.60 LC100 km
Cost / 100 mi37.74 LC100 mi31.54 LC100 mi
Annual fuel used2,010 L531 US gal442 UK gal1,680 L444 US gal370 UK gal
Annual fuel cost3,518 LC/year2,940 LC/year

Head-to-head comparisons

Mercedes-Benz R-class (W251) R 500 V8

  • Has 38 hp more
  • Has 90 Nm more
  • Is 0.2 s quicker from 0-100 km/h

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Smallest trunk

AUDI A6 allroad (4F/C6) 4.2 FSI V8

  • Is 265 kg lighter
  • Uses 2.2 L/100 km less fuel
  • Has 5 hp/t better power-to-weight
  • Has 117 km (73 mi) more estimated range
  • Has 241 L more trunk volume

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power

Choose cars to compare

Brand
Model
Generation
Engine or modification
Mercedes-Benz R-class (W251) R 500 V8
AUDI A6 allroad (4F/C6) 4.2 FSI V8
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