Car comparison

Jaguar XJ (X351) · Facelift 2015 R 5.0 V8vsAlfa Romeo Giulia (952) Quadrifoglio 2.9 V6

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

New comparison

Jaguar XJ (X351) · Facelift 2015

R 5.0 V8

575 hp5000 ccGasolineRWDAutomaticSuperchargedSedan2017-2018
VS

Alfa Romeo Giulia (952)

Quadrifoglio 2.9 V6

510 hp2891 ccGasolineRWDManualTwin-turboSedan2016-2018

Comparison overview

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

Best choices

Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6

  • Quickest 0-100 km/h
    3.9 s
  • Lightest
    1,580 kg
    3,483 lb
  • Best power-to-weight
    323 hp/t
    241 kW/t
    3.1 kg/hp
  • Lowest combined fuel consumption
    8.5 L/100 km
    27.7 mpg US
    33.2 mpg UK
  • Lowest CO2 emissions
    198 g/km
  • Best performance score
    89/100
  • Best economy score
    84/100

Jaguar XJ (X351) Facelift 2015 R 5.0 V8

  • Fastest top speed
    315 km/h
    196 mph Unrestricted
    300 km/h
    186 mph Restricted
  • Most powerful
    575 hp
    429 kW
  • Highest torque
    700 Nm
    516 lb-ft
  • Best estimated range
    721 km
    448 mi
  • Best overall score
    85/100
  • Best practicality score
    78/100

Specification comparison

Specification comparison
ModelJaguarXJ (X351)Facelift 2015R 5.0 V8Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
Power
575hp429kW
510hp380kW
Torque
700Nm516lb-ft
600Nm443lb-ft
Curb weight
1,875kg4,134lb
1,580kg3,483lb
Top speed
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
Calculated
307 km/h
191 mph
To 99% top speed
49.5s99% target: 312 km/h / 194 mph
Calculated
38.5s99% target: 304 km/h / 189 mph
Calculated
0-100 km/h
4.4s
3.9s
0-200 km/h
11.3s
Calculated
9.8s
Calculated
0-60 mph
4.2s
Calculated
3.8s
Calculated
Fuel consumption
11.1L/100 km21.2mpg US25.4mpg UK
8.5L/100 km27.7mpg US33.2mpg UK
Fuel consumption city-
12.8L/100 km18.4mpg US22.1mpg UK
Fuel consumption highway-
6.1L/100 km38.6mpg US46.3mpg UK
Quarter mile
12.0s
Calculated
11.4s
Calculated
Power-to-weight
307hp/t229kW/t139hp/1000 lb
Calculated
323hp/t241kW/t146hp/1000 lb
Calculated
Torque-to-weight
373Nm/t250lb-ft/ton
Calculated
380Nm/t254lb-ft/ton
Calculated
Estimated range
721km448mi
Calculated
682km424mi
Calculated
Displacement
5,000cc305cu in
2,891cc176cu in
Length
5,130mm202in
4,639mm183in
Width
1,899mm75in
1,873mm74in
Height
1,460mm57in
1,426mm56in
Wheelbase
3,032mm119in
2,820mm111in
Front track
1,626mm64in
1,555mm61in
Rear track
1,604mm63in
1,607mm63in
Trunk volume-
480L
Doors
4
4
Seats
5
4
Fuel tank
80L
58L
CO2 emissions
264g/km
198g/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 R 5.0 V8Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6PowerTorque
  • Jaguar XJ (X351) Facelift 2015 R 5.0 V8: Power / Torque
  • Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
JaguarXJ (X351)Facelift 2015R 5.0 V86,250-6,500 rpm3,500-4,500 rpm6,750 rpm
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V66,500 rpm2,500 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricJaguarXJ (X351)Facelift 2015R 5.0 V8Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
Acceleration checkpoints
0-60 mph
0-97 km/h
4.2 s
3.8 s
0-100 km/h
0-62 mph
4.4 s
3.9 s
0-200 km/h
0-124 mph
11.3 s
9.8 s
Top speed
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
Likely limited
307 km/h
191 mph
Drag race simulation
60 ft
18 m
2.3 s
2.2 s
330 ft
101 m
5.6 s
5.3 s
1/8 mile
201 m
8.1 s
7.7 s
1000 ft
305 m
10.3 s
9.7 s
1/4 mile
402 m
12.0 s
11.4 s
Trap speed
1/4 mile
402 m
207 km/h
129 mph
218 km/h
136 mph

Power comparison

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

Chart data table
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V8
575 hp
429 kW
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
510 hp
380 kW

Jaguar XJ (X351) Facelift 2015 R 5.0 V8 has 65 hp more than Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6.

The biggest power difference is between Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6 and Jaguar XJ (X351) Facelift 2015 R 5.0 V8: 65 hp (48 kW).

Torque comparison

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

Chart data table
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V8
700 Nm
516 lb-ft
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
600 Nm
443 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V8
1,875 kg
4,134 lb
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
1,580 kg
3,483 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V8
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
307 km/h
191 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V84.4 s
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V63.9 s

Although Jaguar XJ (X351) Facelift 2015 R 5.0 V8 has more power, Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6 and Jaguar XJ (X351) Facelift 2015 R 5.0 V8: 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
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V8
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
8.5 L/100 km
27.7 mpg US
33.2 mpg UK

The biggest fuel consumption difference is between Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6 and Jaguar XJ (X351) Facelift 2015 R 5.0 V8: 2.6 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
JaguarXJ (X351)Facelift 2015R 5.0 V8
307 hp/t
229 kW/t
3.3 kg/hp
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
323 hp/t
241 kW/t
3.1 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
JaguarXJ (X351)Facelift 2015R 5.0 V8
721 km
448 mi
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
682 km
424 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
JaguarXJ (X351)Facelift 2015R 5.0 V8
575 hp
429 kW
4.4 s
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
510 hp
380 kW
3.9 s
307 km/h
191 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
JaguarXJ (X351)Facelift 2015R 5.0 V8
Power
575 hp
429 kW
0-100 km/h4.4 s
Top speed
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
Doors/seats
4 doors
5 seats
Trunk-
Length
5,130 mm
202.0 in
Height
1,460 mm
57.5 in
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
Power
510 hp
380 kW
0-100 km/h3.9 s
Top speed
307 km/h
191 mph
Doors/seats
4 doors
4 seats
Trunk
480 L
17.0 cu ft
Length
4,639 mm
182.6 in
Height
1,426 mm
56.1 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
JaguarXJ (X351)Facelift 2015R 5.0 V8
Power
575 hp
429 kW
0-100 km/h4.4 s
Top speed
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
Power
510 hp
380 kW
0-100 km/h3.9 s
Top speed
307 km/h
191 mph
8.5 L/100 km
27.7 mpg US
33.2 mpg UK

Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6 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
JaguarXJ (X351)Facelift 2015R 5.0 V8
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
4.4 s
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
3.9 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
JaguarXJ (X351)Facelift 2015R 5.0 V8
307 hp/t
229 kW/t
3.3 kg/hp
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
323 hp/t
241 kW/t
3.1 kg/hp
8.5 L/100 km
27.7 mpg US
33.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleJaguarXJ (X351)Facelift 2015R 5.0 V8Alfa RomeoGiulia (952)Quadrifoglio 2.9 V6
Power
575 hp
429 kW
510 hp
380 kW
Torque
700 Nm
516 lb-ft
600 Nm
443 lb-ft
Acceleration
4.4 s
3.9 s
Top speed
Unrestricted
315 km/h196 mph
Restricted
300 km/h186 mph
307 km/h
191 mph
Lightness
1,875 kg
4,134 lb
1,580 kg
3,483 lb
Fuel consumption
11.1 L/100 km
21.2 mpg US
25.4 mpg UK
8.5 L/100 km
27.7 mpg US
33.2 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
480 L
17.0 cu ft
Length
4,639 mm
182.6 in
Height
1,426 mm
56.1 in
Range score
721 km
448 mi
682 km
424 mi
CO2 score
264 g/km
198 g/km
Trunk score
-
480 L
17.0 cu ft
Power-to-weight score
307 hp/t
229 kW/t
3.3 kg/hp
323 hp/t
241 kW/t
3.1 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 XJ (X351) Facelift 2015 R 5.0 V8Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6
Consumption11.1 L/100 km21.2 mpg US25.4 mpg UK8.5 L/100 km27.7 mpg US33.2 mpg UK
Cost / 100 km19.43 LC100 km14.88 LC100 km
Cost / 100 mi31.26 LC100 mi23.94 LC100 mi
Annual fuel used1,665 L440 US gal366 UK gal1,275 L337 US gal280 UK gal
Annual fuel cost2,914 LC/year2,231 LC/year

Head-to-head comparisons

Jaguar XJ (X351) Facelift 2015 R 5.0 V8

  • Has 65 hp more
  • Has 100 Nm more
  • Has 8 km/h (5 mph) higher top speed
  • Has 38 km (24 mi) more estimated range

Pros

  • Highest top speed
  • Most powerful
  • Highest torque
  • Best estimated range

Cons

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

Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6

  • Is 295 kg lighter
  • Is 0.5 s quicker from 0-100 km/h
  • Uses 2.6 L/100 km less fuel
  • Has 16 hp/t better power-to-weight
  • Emits 66 g/km less CO2

Pros

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

Cons

  • Lowest power
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Jaguar XJ (X351) R 5.0 V8
Alfa Romeo Giulia (952) Quadrifoglio 2.9 V6
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2 vehicles selected

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