Car comparison

Jaguar XK Convertible (X150) R 4.2 V8vsRolls-Royce Phantom Drophead Coupe 6.75 i V12

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

New comparison

Jaguar XK Convertible (X150)

R 4.2 V8

416 hp4196 ccGasolineRWDAutomaticSuperchargedCabriolet / convertible2006-2009
VS

Rolls-Royce Phantom Drophead Coupe

6.75 i V12

460 hp6749 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2007-2016

Comparison overview

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

Best choices

Jaguar XK Convertible (X150) R 4.2 V8

  • Quickest 0-100 km/h
    5.3 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Lightest
    1,710 kg
    3,770 lb
  • Best power-to-weight
    243 hp/t
    181 kW/t
    4.1 kg/hp
  • Lowest combined fuel consumption
    12.3 L/100 km
    19.1 mpg US
    23.0 mpg UK
  • Lowest city consumption
    19.1 L/100 km
    12.3 mpg US
    14.8 mpg UK
  • Lowest highway consumption
    8.6 L/100 km
    27.4 mpg US
    32.8 mpg UK
  • Best estimated range
    578 km
    359 mi
  • Best performance score
    74/100
  • Best economy score
    74/100

Specification comparison

Specification comparison
ModelJaguarXK Convertible (X150)R 4.2 V8Rolls-RoycePhantom Drophead Coupe6.75 i V12
Power
416hp310kW
460hp343kW
Torque
560Nm413lb-ft
720Nm531lb-ft
Curb weight
1,710kg3,770lb
2,620kg5,776lb
Gross weight
2,120kg4,674lb
3,050kg6,724lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Calculated
To 99% top speed
67.9s99% target: 257 km/h / 160 mph
Calculated
98.3s99% target: 248 km/h / 154 mph
Calculated
0-100 km/h
5.3s
5.9s
0-200 km/h
18.6s
Calculated
25.6s
Calculated
0-60 mph
5.0s
Calculated
5.6s
Calculated
Fuel consumption
12.3L/100 km19.1mpg US23.0mpg UK
15.9L/100 km14.8mpg US17.8mpg UK
Fuel consumption city
19.1L/100 km12.3mpg US14.8mpg UK
24.6L/100 km9.6mpg US11.5mpg UK
Fuel consumption highway
8.6L/100 km27.4mpg US32.8mpg UK
11L/100 km21.4mpg US25.7mpg UK
Quarter mile
13.4s
Calculated
14.1s
Calculated
Power-to-weight
243hp/t181kW/t110hp/1000 lb
Calculated
176hp/t131kW/t80hp/1000 lb
Calculated
Torque-to-weight
327Nm/t219lb-ft/ton
Calculated
275Nm/t184lb-ft/ton
Calculated
Estimated range
578km359mi
Calculated
503km313mi
Calculated
Displacement
4,196cc256cu in
6,749cc412cu in
Length
4,791mm189in
5,609mm221in
Width-
1,987mm78in
Height
1,329mm52in
1,581mm62in
Wheelbase
2,752mm108in
3,320mm131in
Front track-
1,685mm66in
Rear track-
1,670mm66in
Ground clearance
120mm5in
-
Trunk volume
200L
315L
Max trunk volume
283L
-
Doors
2
2
Seats
4
5
Fuel tank
71L
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.

Jaguar XK Convertible (X150) R 4.2 V8Rolls-Royce Phantom Drophead Coupe 6.75 i V12PowerTorque
  • Jaguar XK Convertible (X150) R 4.2 V8: Power / Torque
  • Rolls-Royce Phantom Drophead Coupe 6.75 i V12: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
JaguarXK Convertible (X150)R 4.2 V86,250 rpm4,000 rpm6,500 rpm
Rolls-RoycePhantom Drophead Coupe6.75 i V125,350 rpm3,500 rpm5,600 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricJaguarXK Convertible (X150)R 4.2 V8Rolls-RoycePhantom Drophead Coupe6.75 i V12
Acceleration checkpoints
0-60 mph
0-97 km/h
5.0 s
5.6 s
0-100 km/h
0-62 mph
5.3 s
5.9 s
0-200 km/h
0-124 mph
18.6 s
25.6 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.2 s
330 ft
101 m
5.9 s
6.0 s
1/8 mile
201 m
8.8 s
9.1 s
1000 ft
305 m
11.3 s
11.8 s
1/4 mile
402 m
13.4 s
14.1 s
Trap speed
1/4 mile
402 m
174 km/h
108 mph
159 km/h
99 mph

Power comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V8
416 hp
310 kW
Rolls-RoycePhantom Drophead Coupe6.75 i V12
460 hp
343 kW

Rolls-Royce Phantom Drophead Coupe 6.75 i V12 has 44 hp more than Jaguar XK Convertible (X150) R 4.2 V8.

The biggest power difference is between Jaguar XK Convertible (X150) R 4.2 V8 and Rolls-Royce Phantom Drophead Coupe 6.75 i V12: 44 hp (33 kW).

Torque comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V8
560 Nm
413 lb-ft
Rolls-RoycePhantom Drophead Coupe6.75 i V12
720 Nm
531 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V8
1,710 kg
3,770 lb
Rolls-RoycePhantom Drophead Coupe6.75 i V12
2,620 kg
5,776 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V8
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Rolls-RoycePhantom Drophead Coupe6.75 i V12
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V85.3 s
Rolls-RoycePhantom Drophead Coupe6.75 i V125.9 s

Although Rolls-Royce Phantom Drophead Coupe 6.75 i V12 has more power, Jaguar XK Convertible (X150) R 4.2 V8 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Jaguar XK Convertible (X150) R 4.2 V8 and Rolls-Royce Phantom Drophead Coupe 6.75 i V12: 0.6 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V8
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
Rolls-RoycePhantom Drophead Coupe6.75 i V12
15.9 L/100 km
14.8 mpg US
17.8 mpg UK

The biggest fuel consumption difference is between Jaguar XK Convertible (X150) R 4.2 V8 and Rolls-Royce Phantom Drophead Coupe 6.75 i V12: 3.6 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
JaguarXK Convertible (X150)R 4.2 V8
243 hp/t
181 kW/t
4.1 kg/hp
Rolls-RoycePhantom Drophead Coupe6.75 i V12
176 hp/t
131 kW/t
5.7 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
JaguarXK Convertible (X150)R 4.2 V8
578 km
359 mi
Rolls-RoycePhantom Drophead Coupe6.75 i V12
503 km
313 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
JaguarXK Convertible (X150)R 4.2 V8
416 hp
310 kW
5.3 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Rolls-RoycePhantom Drophead Coupe6.75 i V12
460 hp
343 kW
5.9 s
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 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
JaguarXK Convertible (X150)R 4.2 V8
Power
416 hp
310 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
200 L
7.1 cu ft
Length
4,791 mm
188.6 in
Height
1,329 mm
52.3 in
Rolls-RoycePhantom Drophead Coupe6.75 i V12
Power
460 hp
343 kW
0-100 km/h5.9 s
Top speed
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Doors/seats
2 doors
5 seats
Trunk
315 L
11.1 cu ft
Length
5,609 mm
220.8 in
Height
1,581 mm
62.2 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
JaguarXK Convertible (X150)R 4.2 V8
Power
416 hp
310 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
Rolls-RoycePhantom Drophead Coupe6.75 i V12
Power
460 hp
343 kW
0-100 km/h5.9 s
Top speed
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
15.9 L/100 km
14.8 mpg US
17.8 mpg UK

Jaguar XK Convertible (X150) R 4.2 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
JaguarXK Convertible (X150)R 4.2 V8
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
5.3 s
Rolls-RoycePhantom Drophead Coupe6.75 i V12
15.9 L/100 km
14.8 mpg US
17.8 mpg UK
5.9 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
JaguarXK Convertible (X150)R 4.2 V8
243 hp/t
181 kW/t
4.1 kg/hp
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
Rolls-RoycePhantom Drophead Coupe6.75 i V12
176 hp/t
131 kW/t
5.7 kg/hp
15.9 L/100 km
14.8 mpg US
17.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleJaguarXK Convertible (X150)R 4.2 V8Rolls-RoycePhantom Drophead Coupe6.75 i V12
Power
416 hp
310 kW
460 hp
343 kW
Torque
560 Nm
413 lb-ft
720 Nm
531 lb-ft
Acceleration
5.3 s
5.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
250 km/h155 mph
Restricted
240 km/h149 mph
Lightness
1,710 kg
3,770 lb
2,620 kg
5,776 lb
Fuel consumption
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
15.9 L/100 km
14.8 mpg US
17.8 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
200 L
7.1 cu ft
Length
4,791 mm
188.6 in
Height
1,329 mm
52.3 in
Doors/seats
2 doors
5 seats
Trunk
315 L
11.1 cu ft
Length
5,609 mm
220.8 in
Height
1,581 mm
62.2 in
Range score
578 km
359 mi
503 km
313 mi
Trunk score
200 L
7.1 cu ft
315 L
11.1 cu ft
Power-to-weight score
243 hp/t
181 kW/t
4.1 kg/hp
176 hp/t
131 kW/t
5.7 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
VehicleJaguar XK Convertible (X150) R 4.2 V8Rolls-Royce Phantom Drophead Coupe 6.75 i V12
Consumption12.3 L/100 km19.1 mpg US23 mpg UK15.9 L/100 km14.8 mpg US17.8 mpg UK
Cost / 100 km21.53 LC100 km27.83 LC100 km
Cost / 100 mi34.64 LC100 mi44.78 LC100 mi
Annual fuel used1,845 L487 US gal406 UK gal2,385 L630 US gal525 UK gal
Annual fuel cost3,229 LC/year4,174 LC/year

Head-to-head comparisons

Jaguar XK Convertible (X150) R 4.2 V8

  • Is 910 kg lighter
  • Is 0.6 s quicker from 0-100 km/h
  • Has 10 km/h (6 mph) higher top speed
  • Uses 3.6 L/100 km less fuel
  • Has 68 hp/t better power-to-weight
  • Has 75 km (47 mi) more estimated range

Pros

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

Cons

  • Lowest power
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
Jaguar XK Convertible (X150) R 4.2 V8
Rolls-Royce Phantom Drophead Coupe 6.75 i V12
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