Car comparison

BMW 6 Series (E63) 645CivsMG Xpower SV 4.6 i V8 32V

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

New comparison

BMW 6 Series (E63)

645Ci

333 hp4398 ccGasolineRWDManualNaturally aspiratedCoupe2003-2005
VS

MG Xpower SV

4.6 i V8 32V

320 hp4600 ccGasolineFWDManualNaturally aspiratedCoupe2003-2005

Comparison overview

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

Best choices

BMW 6 Series (E63) 645Ci

  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    333 hp
    248 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Lowest highway consumption
    8.6 L/100 km
    27.4 mpg US
    32.8 mpg UK
  • Largest trunk
    450 L
  • Best overall score
    63/100
  • Best performance score
    68/100
  • Best economy score
    75/100
  • Best practicality score
    53/100

MG Xpower SV 4.6 i V8 32V

  • Quickest 0-100 km/h
    5.4 s
  • Lightest
    1,540 kg
    3,395 lb
  • Best power-to-weight
    208 hp/t
    155 kW/t
    4.8 kg/hp
  • Lowest city consumption
    16.0 L/100 km
    14.7 mpg US
    17.7 mpg UK

Specification comparison

Specification comparison
ModelBMW6 Series (E63)645CiMGXpower SV4.6 i V8 32V
Power
333hp248kW
320hp239kW
Torque
450Nm332lb-ft
410Nm302lb-ft
Curb weight
1,690kg3,726lb
1,540kg3,395lb
Gross weight
2,065kg4,553lb
-
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
254 km/h
158 mph
To 99% top speed
76.8s99% target: 262 km/h / 163 mph
Calculated
68.8s99% target: 251 km/h / 156 mph
Calculated
0-100 km/h
5.6s
5.4s
0-200 km/h
19.6s
Calculated
19.7s
Calculated
0-60 mph
5.3s
Calculated
5.1s
Calculated
Fuel consumption
11.7L/100 km20.1mpg US24.1mpg UK
-
Fuel consumption city
17.2L/100 km13.7mpg US16.4mpg UK
16L/100 km14.7mpg US17.7mpg UK
Fuel consumption highway
8.6L/100 km27.4mpg US32.8mpg UK
11L/100 km21.4mpg US25.7mpg UK
Quarter mile
13.7s
Calculated
13.5s
Calculated
Power-to-weight
197hp/t147kW/t89hp/1000 lb
Calculated
208hp/t155kW/t94hp/1000 lb
Calculated
Torque-to-weight
266Nm/t178lb-ft/ton
Calculated
266Nm/t178lb-ft/ton
Calculated
Estimated range
598km372mi
Calculated
-
Displacement
4,398cc268cu in
4,600cc281cu in
Length
4,820mm190in
4,480mm176in
Width
1,855mm73in
1,900mm75in
Height
1,373mm54in
1,320mm52in
Wheelbase
2,780mm109in
2,670mm105in
Front track
1,558mm61in
1,678mm66in
Rear track
1,592mm63in
1,626mm64in
Trunk volume
450L
250L
Doors
2
2
Seats
4
2
Fuel tank
70L
80L
CO2 emissions
283g/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 6 Series (E63) 645CiMG Xpower SV 4.6 i V8 32VPowerTorque
  • BMW 6 Series (E63) 645Ci: Power / Torque
  • MG Xpower SV 4.6 i V8 32V: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series (E63)645Ci6,100 rpm3,600 rpm6,350 rpm
MGXpower SV4.6 i V8 32V6,000 rpm4,750 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series (E63)645CiMGXpower SV4.6 i V8 32V
Acceleration checkpoints
0-60 mph
0-97 km/h
5.3 s
5.1 s
0-100 km/h
0-62 mph
5.6 s
5.4 s
0-200 km/h
0-124 mph
19.6 s
19.7 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
254 km/h
158 mph
Drag race simulation
60 ft
18 m
2.3 s
2.2 s
330 ft
101 m
6.0 s
5.9 s
1/8 mile
201 m
9.0 s
8.9 s
1000 ft
305 m
11.6 s
11.4 s
1/4 mile
402 m
13.7 s
13.5 s
Trap speed
1/4 mile
402 m
170 km/h
106 mph
171 km/h
106 mph

Power comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
333 hp
248 kW
MGXpower SV4.6 i V8 32V
320 hp
239 kW

BMW 6 Series (E63) 645Ci has 13 hp more than MG Xpower SV 4.6 i V8 32V.

The biggest power difference is between MG Xpower SV 4.6 i V8 32V and BMW 6 Series (E63) 645Ci: 13 hp (10 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
450 Nm
332 lb-ft
MGXpower SV4.6 i V8 32V
410 Nm
302 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
1,690 kg
3,726 lb
MGXpower SV4.6 i V8 32V
1,540 kg
3,395 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
MGXpower SV4.6 i V8 32V
254 km/h
158 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci5.6 s
MGXpower SV4.6 i V8 32V5.4 s

Although BMW 6 Series (E63) 645Ci has more power, MG Xpower SV 4.6 i V8 32V is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between MG Xpower SV 4.6 i V8 32V and BMW 6 Series (E63) 645Ci: 0.2 s.

Power-to-weight comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
197 hp/t
147 kW/t
5.1 kg/hp
MGXpower SV4.6 i V8 32V
208 hp/t
155 kW/t
4.8 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series (E63)645Ci
333 hp
248 kW
5.6 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
MGXpower SV4.6 i V8 32V
320 hp
239 kW
5.4 s
254 km/h
158 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
BMW6 Series (E63)645Ci
Power
333 hp
248 kW
0-100 km/h5.6 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
450 L
15.9 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
MGXpower SV4.6 i V8 32V
Power
320 hp
239 kW
0-100 km/h5.4 s
Top speed
254 km/h
158 mph
Doors/seats
2 doors
2 seats
Trunk
250 L
8.8 cu ft
Length
4,480 mm
176.4 in
Height
1,320 mm
52.0 in

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series (E63)645CiMGXpower SV4.6 i V8 32V
Power
333 hp
248 kW
320 hp
239 kW
Torque
450 Nm
332 lb-ft
410 Nm
302 lb-ft
Acceleration
5.6 s
5.4 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
254 km/h
158 mph
Lightness
1,690 kg
3,726 lb
1,540 kg
3,395 lb
Fuel consumption
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
-
Practicality
Doors/seats
2 doors
4 seats
Trunk
450 L
15.9 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
Doors/seats
2 doors
2 seats
Trunk
250 L
8.8 cu ft
Length
4,480 mm
176.4 in
Height
1,320 mm
52.0 in
Range score
598 km
372 mi
-
CO2 score
283 g/km
-
Trunk score
450 L
15.9 cu ft
250 L
8.8 cu ft
Power-to-weight score
197 hp/t
147 kW/t
5.1 kg/hp
208 hp/t
155 kW/t
4.8 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 6 Series (E63) 645Ci
Consumption11.7 L/100 km20.1 mpg US24.1 mpg UK
Cost / 100 km20.47 LC100 km
Cost / 100 mi32.95 LC100 mi
Annual fuel used1,755 L464 US gal386 UK gal
Annual fuel cost3,071 LC/year

Head-to-head comparisons

BMW 6 Series (E63) 645Ci

  • Has 13 hp more
  • Has 40 Nm more
  • Has 11 km/h (7 mph) higher top speed
  • Has 200 L more trunk volume

Pros

  • Highest top speed
  • Most powerful
  • Highest torque
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Heaviest

MG Xpower SV 4.6 i V8 32V

  • Is 150 kg lighter
  • Is 0.2 s quicker from 0-100 km/h
  • Has 11 hp/t better power-to-weight

Pros

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

Cons

  • Lowest power
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series (E63) 645Ci
MG Xpower SV 4.6 i V8 32V
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