Car comparison

BMW M8 Convertible (F91) 4.4 V8vsRolls-Royce Dawn 6.6 V12

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

New comparison

BMW M8 Convertible (F91)

4.4 V8

600 hp4395 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2019-2022
VS

Rolls-Royce Dawn

6.6 V12

601 hp6592 ccGasolineRWDAutomaticTwin-turboCabriolet / convertible2017-present

Comparison overview

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

Best choices

BMW M8 Convertible (F91) 4.4 V8

  • Quickest 0-100 km/h
    3.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Lightest
    2,010 kg
    4,431 lb
  • Best power-to-weight
    299 hp/t
    223 kW/t
    3.4 kg/hp
  • Lowest combined fuel consumption
    10.8 L/100 km
    21.8 mpg US
    26.2 mpg UK
  • Lowest city consumption
    15.2 L/100 km
    15.5 mpg US
    18.6 mpg UK
  • Lowest highway consumption
    8.2 L/100 km
    28.7 mpg US
    34.4 mpg UK
  • Lowest CO2 emissions
    246 g/km
  • Largest trunk
    350 L
  • Best overall score
    75/100
  • Best performance score
    87/100
  • Best economy score
    78/100
  • Best practicality score
    48/100

Specification comparison

Specification comparison
ModelBMWM8 Convertible (F91)4.4 V8Rolls-RoyceDawn6.6 V12
Power
600hp447kW
601hp448kW
Torque
750Nm553lb-ft
840Nm620lb-ft
Curb weight
2,010kg4,431lb
2,560kg5,644lb
Gross weight
2,440kg5,379lb
-
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
39.2s99% target: 257 km/h / 160 mph
Calculated
73.6s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
3.4s
4.9s
0-200 km/h
11.3s
18.6s
Calculated
0-60 mph
3.2s
Calculated
4.6s
Calculated
Fuel consumption
10.8L/100 km21.8mpg US26.2mpg UK
14.7L/100 km16mpg US19.2mpg UK
Fuel consumption city
15.2L/100 km15.5mpg US18.6mpg UK
22.9L/100 km10.3mpg US12.3mpg UK
Fuel consumption highway
8.2L/100 km28.7mpg US34.4mpg UK
10.1L/100 km23.3mpg US28.0mpg UK
Quarter mile
11.3s
Calculated
13.1s
Calculated
Power-to-weight
299hp/t223kW/t135hp/1000 lb
Calculated
235hp/t175kW/t106hp/1000 lb
Calculated
Torque-to-weight
373Nm/t250lb-ft/ton
Calculated
328Nm/t220lb-ft/ton
Calculated
Estimated range
630km391mi
Calculated
-
Displacement
4,395cc268cu in
6,592cc402cu in
Length
4,867mm192in
5,285mm208in
Width
1,907mm75in
1,947mm77in
Height
1,353mm53in
1,502mm59in
Wheelbase
2,827mm111in
3,112mm123in
Front track
1,627mm64in
1,618mm64in
Rear track
1,632mm64in
1,665mm66in
Trunk volume-
321L
Max trunk volume
350L
-
Doors
2
2
Seats
4
4
Fuel tank
68L
-
CO2 emissions
246g/km
337g/km

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.

BMW M8 Convertible (F91) 4.4 V8Rolls-Royce Dawn 6.6 V12PowerTorque
  • BMW M8 Convertible (F91) 4.4 V8: Power / Torque
  • Rolls-Royce Dawn 6.6 V12: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMWM8 Convertible (F91)4.4 V86,000 rpm1,800-5,600 rpm6,250 rpm
Rolls-RoyceDawn6.6 V125,250-6,000 rpm1,650-4,750 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMWM8 Convertible (F91)4.4 V8Rolls-RoyceDawn6.6 V12
Acceleration checkpoints
0-60 mph
0-97 km/h
3.2 s
4.6 s
0-100 km/h
0-62 mph
3.4 s
4.9 s
0-200 km/h
0-124 mph
11.3 s
18.6 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
1.9 s
2.1 s
330 ft
101 m
4.9 s
5.6 s
1/8 mile
201 m
7.4 s
8.5 s
1000 ft
305 m
9.5 s
11.0 s
1/4 mile
402 m
11.3 s
13.1 s
Trap speed
1/4 mile
402 m
200 km/h
124 mph
173 km/h
108 mph

Power comparison

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

Chart data table
VehicleValue
BMWM8 Convertible (F91)4.4 V8
600 hp
447 kW
Rolls-RoyceDawn6.6 V12
601 hp
448 kW

Rolls-Royce Dawn 6.6 V12 has 1 hp more than BMW M8 Convertible (F91) 4.4 V8.

The biggest power difference is between BMW M8 Convertible (F91) 4.4 V8 and Rolls-Royce Dawn 6.6 V12: 1 hp (1 kW).

Torque comparison

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

Chart data table
VehicleValue
BMWM8 Convertible (F91)4.4 V8
750 Nm
553 lb-ft
Rolls-RoyceDawn6.6 V12
840 Nm
620 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMWM8 Convertible (F91)4.4 V8
2,010 kg
4,431 lb
Rolls-RoyceDawn6.6 V12
2,560 kg
5,644 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMWM8 Convertible (F91)4.4 V8
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Rolls-RoyceDawn6.6 V12
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
BMWM8 Convertible (F91)4.4 V83.4 s
Rolls-RoyceDawn6.6 V124.9 s

Although Rolls-Royce Dawn 6.6 V12 has more power, BMW M8 Convertible (F91) 4.4 V8 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW M8 Convertible (F91) 4.4 V8 and Rolls-Royce Dawn 6.6 V12: 1.5 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMWM8 Convertible (F91)4.4 V8
10.8 L/100 km
21.8 mpg US
26.2 mpg UK
Rolls-RoyceDawn6.6 V12
14.7 L/100 km
16.0 mpg US
19.2 mpg UK

The biggest fuel consumption difference is between BMW M8 Convertible (F91) 4.4 V8 and Rolls-Royce Dawn 6.6 V12: 3.9 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
BMWM8 Convertible (F91)4.4 V8
299 hp/t
223 kW/t
3.3 kg/hp
Rolls-RoyceDawn6.6 V12
235 hp/t
175 kW/t
4.3 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMWM8 Convertible (F91)4.4 V8
600 hp
447 kW
3.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Rolls-RoyceDawn6.6 V12
601 hp
448 kW
4.9 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
BMWM8 Convertible (F91)4.4 V8
Power
600 hp
447 kW
0-100 km/h3.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
350 L
12.4 cu ft
Length
4,867 mm
191.6 in
Height
1,353 mm
53.3 in
Rolls-RoyceDawn6.6 V12
Power
601 hp
448 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
321 L
11.3 cu ft
Length
5,285 mm
208.1 in
Height
1,502 mm
59.1 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
BMWM8 Convertible (F91)4.4 V8
Power
600 hp
447 kW
0-100 km/h3.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
10.8 L/100 km
21.8 mpg US
26.2 mpg UK
Rolls-RoyceDawn6.6 V12
Power
601 hp
448 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
14.7 L/100 km
16.0 mpg US
19.2 mpg UK

BMW M8 Convertible (F91) 4.4 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
BMWM8 Convertible (F91)4.4 V8
10.8 L/100 km
21.8 mpg US
26.2 mpg UK
3.4 s
Rolls-RoyceDawn6.6 V12
14.7 L/100 km
16.0 mpg US
19.2 mpg UK
4.9 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
BMWM8 Convertible (F91)4.4 V8
299 hp/t
223 kW/t
3.4 kg/hp
10.8 L/100 km
21.8 mpg US
26.2 mpg UK
Rolls-RoyceDawn6.6 V12
235 hp/t
175 kW/t
4.3 kg/hp
14.7 L/100 km
16.0 mpg US
19.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMWM8 Convertible (F91)4.4 V8Rolls-RoyceDawn6.6 V12
Power
600 hp
447 kW
601 hp
448 kW
Torque
750 Nm
553 lb-ft
840 Nm
620 lb-ft
Acceleration
3.4 s
4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
2,010 kg
4,431 lb
2,560 kg
5,644 lb
Fuel consumption
10.8 L/100 km
21.8 mpg US
26.2 mpg UK
14.7 L/100 km
16.0 mpg US
19.2 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
350 L
12.4 cu ft
Length
4,867 mm
191.6 in
Height
1,353 mm
53.3 in
Doors/seats
2 doors
4 seats
Trunk
321 L
11.3 cu ft
Length
5,285 mm
208.1 in
Height
1,502 mm
59.1 in
Range score
630 km
391 mi
-
CO2 score
246 g/km
337 g/km
Trunk score
350 L
12.4 cu ft
321 L
11.3 cu ft
Power-to-weight score
299 hp/t
223 kW/t
3.4 kg/hp
235 hp/t
175 kW/t
4.3 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
VehicleBMW M8 Convertible (F91) 4.4 V8Rolls-Royce Dawn 6.6 V12
Consumption10.8 L/100 km21.8 mpg US26.2 mpg UK14.7 L/100 km16 mpg US19.2 mpg UK
Cost / 100 km18.90 LC100 km25.72 LC100 km
Cost / 100 mi30.42 LC100 mi41.40 LC100 mi
Annual fuel used1,620 L428 US gal356 UK gal2,205 L582 US gal485 UK gal
Annual fuel cost2,835 LC/year3,859 LC/year

Head-to-head comparisons

BMW M8 Convertible (F91) 4.4 V8

  • Is 550 kg lighter
  • Is 1.5 s quicker from 0-100 km/h
  • Uses 3.9 L/100 km less fuel
  • Has 64 hp/t better power-to-weight
  • Has 29 L more trunk volume
  • Emits 91 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Largest trunk

Cons

  • Lowest power

Rolls-Royce Dawn 6.6 V12

  • Has 1 hp more
  • Has 90 Nm more

Pros

  • Most powerful
  • Highest torque

Cons

  • Slowest 0-100 km/h
  • Highest combined fuel consumption
  • Heaviest
  • Smallest trunk
  • Highest CO2 emissions

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW M8 Convertible (F91) 4.4 V8
Rolls-Royce Dawn 6.6 V12
Compare selected cars
2 vehicles selected

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