Car comparison

Jaguar XJ (X351) · Facelift 2015 5.0 V8vsRolls-Royce Phantom VIII Extended Wheelbase 6.7 V12

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

New comparison

Jaguar XJ (X351) · Facelift 2015

5.0 V8

510 hp5000 ccGasolineRWDAutomaticSuperchargedSedan2015-2018

Rolls-Royce Phantom VIII Extended Wheelbase

6.7 V12

571 hp6749 ccGasolineRWDAutomaticTwin-turboSedan2017-present

Comparison overview

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

Jaguar XJ (X351) Facelift 2015 5.0 V8

Quickest 0-100 km/h
4.9 s
Fastest top speed
265 km/h
165 mph Unrestricted
250 km/h
155 mph Restricted
Lightest
1,875 kg
4,134 lb
Best power-to-weight
272 hp/t
203 kW/t
3.7 kg/hp
Lowest combined fuel consumption
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
Lowest CO2 emissions
264 g/km
Best overall score
80/100
Best performance score
81/100
Best economy score
77/100
Best practicality score
78/100

Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12

Most powerful
571 hp
426 kW
Highest torque
900 Nm
664 lb-ft

Specification comparison

Specification comparison
Model	JaguarXJ (X351)Facelift 20155.0 V8	Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12
Power	510hp380kW	571hp426kW
Torque	625Nm461lb-ft	900Nm664lb-ft
Curb weight	1,875kg4,134lb	2,610kg5,754lb
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	46.9s99% target: 262 km/h / 163 mph Calculated	59.2s99% target: 262 km/h / 163 mph Calculated
0-100 km/h	4.9s	5.4s
0-200 km/h	14.4s Calculated	17.0s Calculated
0-60 mph	4.7s Calculated	5.2s Calculated
Fuel consumption	11.1L/100 km21.2mpg US25.4mpg UK	13.9L/100 km16.9mpg US20.3mpg UK
Fuel consumption city	-	21.3L/100 km11mpg US13.3mpg UK
Fuel consumption highway	-	9.7L/100 km24.2mpg US29.1mpg UK
Quarter mile	12.8s Calculated	13.4s Calculated
Power-to-weight	272hp/t203kW/t123hp/1000 lb Calculated	219hp/t163kW/t99hp/1000 lb Calculated
Torque-to-weight	333Nm/t223lb-ft/ton Calculated	345Nm/t231lb-ft/ton Calculated
Estimated range	721km448mi Calculated	-
Displacement	5,000cc305cu in	6,749cc412cu in
Length	5,130mm202in	5,982mm236in
Width	1,899mm75in	2,018mm79in
Height	1,460mm57in	1,656mm65in
Wheelbase	3,032mm119in	3,772mm149in
Front track	1,626mm64in	-
Rear track	1,604mm63in	-
Doors	4	4
Seats	5	4
Fuel tank	80L	-
CO2 emissions	264g/km	319g/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.

Jaguar XJ (X351) Facelift 2015 5.0 V8Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
JaguarXJ (X351)Facelift 20155.0 V8	6,000-6,500 rpm	2,500-5,500 rpm	6,750 rpm
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	5,000 rpm	1,700 rpm	5,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	JaguarXJ (X351)Facelift 20155.0 V8	Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12
	Acceleration checkpoints
0-60 mph 0-97 km/h	4.7 s	5.2 s
0-100 km/h 0-62 mph	4.9 s	5.4 s
0-200 km/h 0-124 mph	14.4 s	17.0 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 Likely limited
	Drag race simulation
60 ft 18 m	2.4 s	2.4 s
330 ft 101 m	5.8 s	6.0 s
1/8 mile 201 m	8.5 s	8.9 s
1000 ft 305 m	10.9 s	11.3 s
1/4 mile 402 m	12.8 s	13.4 s
Trap speed 1/4 mile 402 m	189 km/h 117 mph	179 km/h 111 mph

Power comparison

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

Chart data table
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	510 hp 380 kW
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	571 hp 426 kW

Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12 has 61 hp more than Jaguar XJ (X351) Facelift 2015 5.0 V8.

The biggest power difference is between Jaguar XJ (X351) Facelift 2015 5.0 V8 and Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12: 61 hp (45 kW).

Torque comparison

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

Chart data table
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	625 Nm 461 lb-ft
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	900 Nm 664 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	1,875 kg 4,134 lb
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	2,610 kg 5,754 lb

Top speed without limiter comparison

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

Chart data table
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	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
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	4.9 s
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	5.4 s

Although Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12 has more power, Jaguar XJ (X351) Facelift 2015 5.0 V8 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Jaguar XJ (X351) Facelift 2015 5.0 V8 and Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12: 0.5 s.

Fuel consumption comparison

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

Chart data table
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	11.1 L/100 km 21.2 mpg US 25.4 mpg UK
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	13.9 L/100 km 16.9 mpg US 20.3 mpg UK

The biggest fuel consumption difference is between Jaguar XJ (X351) Facelift 2015 5.0 V8 and Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12: 2.8 L/100 km.

Power-to-weight comparison

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

Chart data table
Vehicle	Value
JaguarXJ (X351)Facelift 20155.0 V8	272 hp/t 203 kW/t 3.7 kg/hp
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	219 hp/t 163 kW/t 4.6 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
JaguarXJ (X351)Facelift 20155.0 V8	510 hp 380 kW	4.9 s	Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	571 hp 426 kW	5.4 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.

Vehicle

Performance score

Practicality score

JaguarXJ (X351)Facelift 20155.0 V8

Power	510 hp 380 kW
0-100 km/h	4.9 s
Top speed Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph

Doors/seats	4 doors 5 seats
Trunk	-
Length	5,130 mm 202.0 in
Height	1,460 mm 57.5 in

Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12

Power	571 hp 426 kW
0-100 km/h	5.4 s
Top speed Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph

Doors/seats	4 doors 4 seats
Trunk	-
Length	5,982 mm 235.5 in
Height	1,656 mm 65.2 in

Performance vs fuel economy

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

Vehicle

Performance score

Fuel economy score

JaguarXJ (X351)Facelift 20155.0 V8

Power	510 hp 380 kW
0-100 km/h	4.9 s
Top speed Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph

11.1 L/100 km

21.2 mpg US

25.4 mpg UK

Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12

Power	571 hp 426 kW
0-100 km/h	5.4 s
Top speed Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph

13.9 L/100 km

16.9 mpg US

20.3 mpg UK

Jaguar XJ (X351) Facelift 2015 5.0 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
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
JaguarXJ (X351)Facelift 20155.0 V8	11.1 L/100 km 21.2 mpg US 25.4 mpg UK	4.9 s
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	13.9 L/100 km 16.9 mpg US 20.3 mpg UK	5.4 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
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
JaguarXJ (X351)Facelift 20155.0 V8	272 hp/t 203 kW/t 3.7 kg/hp	11.1 L/100 km 21.2 mpg US 25.4 mpg UK
Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12	219 hp/t 163 kW/t 4.6 kg/hp	13.9 L/100 km 16.9 mpg US 20.3 mpg UK

Detailed score breakdown

Vehicle

JaguarXJ (X351)Facelift 20155.0 V8

Rolls-RoycePhantom VIII Extended Wheelbase6.7 V12

Power

510 hp

380 kW

571 hp

426 kW

Torque

625 Nm

461 lb-ft

900 Nm

664 lb-ft

Acceleration

4.9 s

5.4 s

Top speed

Unrestricted

265 km/h165 mph

Restricted

250 km/h155 mph

Unrestricted

265 km/h165 mph

Restricted

250 km/h155 mph

Lightness

1,875 kg

4,134 lb

2,610 kg

5,754 lb

Fuel consumption

11.1 L/100 km

21.2 mpg US

25.4 mpg UK

13.9 L/100 km

16.9 mpg US

20.3 mpg UK

Practicality

Doors/seats	4 doors 5 seats
Trunk	-
Length	5,130 mm 202.0 in
Height	1,460 mm 57.5 in

Doors/seats	4 doors 4 seats
Trunk	-
Length	5,982 mm 235.5 in
Height	1,656 mm 65.2 in

Range score

721 km

448 mi

CO2 score

264 g/km

319 g/km

Power-to-weight score

272 hp/t

203 kW/t

3.7 kg/hp

219 hp/t

163 kW/t

4.6 kg/hp

Overall

Fixed score

Fuel cost and annual usage

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

Average annual distanceDistance unitFuel price in your local currencyPrice unit

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
Vehicle	Jaguar XJ (X351) Facelift 2015 5.0 V8	Rolls-Royce Phantom VIII Extended Wheelbase 6.7 V12
Consumption	11.1 L/100 km21.2 mpg US25.4 mpg UK	13.9 L/100 km16.9 mpg US20.3 mpg UK
Cost / 100 km	19.43 LC100 km	24.33 LC100 km
Cost / 100 mi	31.26 LC100 mi	39.15 LC100 mi
Annual fuel used	1,665 L440 US gal366 UK gal	2,085 L551 US gal459 UK gal
Annual fuel cost	2,914 LC/year	3,649 LC/year