Car comparison

BMW 6 Series (E63) 645CivsBMW 6 Series Gran Turismo (G32) 640i

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

BMW 6 Series Gran Turismo (G32)

640i

340 hp2998 ccGasolineAWDAutomaticTurbocharged2017-2020

Comparison overview

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

Best choices

BMW 6 Series Gran Turismo (G32) 640i

  • Quickest 0-100 km/h
    5.3 s
  • Most powerful
    340 hp
    254 kW
  • Lowest combined fuel consumption
    8.2 L/100 km
    28.7 mpg US
    34.4 mpg UK
  • Lowest city consumption
    11.1 L/100 km
    21.2 mpg US
    25.4 mpg UK
  • Lowest highway consumption
    6.5 L/100 km
    36.2 mpg US
    43.5 mpg UK
  • Lowest CO2 emissions
    187 g/km
  • Best estimated range
    829 km
    515 mi
  • Largest trunk
    610 L
  • Best overall score
    72/100
  • Best economy score
    85/100
  • Best practicality score
    79/100

BMW 6 Series (E63) 645Ci

  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Highest torque
    450 Nm
    332 lb-ft
  • Lightest
    1,690 kg
    3,726 lb
  • Best power-to-weight
    197 hp/t
    147 kW/t
    5.1 kg/hp
  • Best performance score
    68/100

Specification comparison

Specification comparison
ModelBMW6 Series (E63)645CiBMW6 Series Gran Turismo (G32)640i
Power
333hp248kW
340hp254kW
Torque
450Nm332lb-ft
450Nm332lb-ft
Curb weight
1,690kg3,726lb
1,835kg4,045lb
Gross weight
2,065kg4,553lb
2,515kg5,545lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
77.3s99% target: 262 km/h / 163 mph
Calculated
71.6s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.6s
5.3s
0-200 km/h
19.7s
Calculated
19.1s
Calculated
0-60 mph
5.3s
Calculated
5.0s
Calculated
Fuel consumption
11.7L/100 km20.1mpg US24.1mpg UK
8.2L/100 km28.7mpg US34.4mpg UK
Fuel consumption city
17.2L/100 km13.7mpg US16.4mpg UK
11.1L/100 km21.2mpg US25.4mpg UK
Fuel consumption highway
8.6L/100 km27.4mpg US32.8mpg UK
6.5L/100 km36.2mpg US43.5mpg UK
Quarter mile
13.7s
Calculated
13.4s
Calculated
Power-to-weight
197hp/t147kW/t89hp/1000 lb
Calculated
185hp/t138kW/t84hp/1000 lb
Calculated
Torque-to-weight
266Nm/t178lb-ft/ton
Calculated
245Nm/t164lb-ft/ton
Calculated
Estimated range
598km372mi
Calculated
829km515mi
Calculated
Displacement
4,398cc268cu in
2,998cc183cu in
Length
4,820mm190in
5,091mm200in
Width
1,855mm73in
1,902mm75in
Height
1,373mm54in
1,540mm61in
Wheelbase
2,780mm109in
3,070mm121in
Front track
1,558mm61in
1,615mm64in
Rear track
1,592mm63in
1,647mm65in
Ground clearance-
138mm5in
Trunk volume
450L
610L
Max trunk volume-
1,800L
Doors
2
5
Seats
4
5
Fuel tank
70L
68L
CO2 emissions
283g/km
187g/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) 645CiBMW 6 Series Gran Turismo (G32) 640iPowerTorque
  • BMW 6 Series (E63) 645Ci: Power / Torque
  • BMW 6 Series Gran Turismo (G32) 640i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series (E63)645Ci6,100 rpm3,600 rpm6,350 rpm
BMW6 Series Gran Turismo (G32)640i5,500-6,500 rpm1,380-5,200 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series (E63)645CiBMW6 Series Gran Turismo (G32)640i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.3 s
5.0 s
0-100 km/h
0-62 mph
5.6 s
5.3 s
0-200 km/h
0-124 mph
19.7 s
19.1 s
Top speed
Unrestricted
265 km/h165 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
2.3 s
2.2 s
330 ft
101 m
6.0 s
5.8 s
1/8 mile
201 m
9.0 s
8.8 s
1000 ft
305 m
11.6 s
11.3 s
1/4 mile
402 m
13.7 s
13.4 s
Trap speed
1/4 mile
402 m
170 km/h
106 mph
172 km/h
107 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
BMW6 Series Gran Turismo (G32)640i
340 hp
254 kW

BMW 6 Series Gran Turismo (G32) 640i has 7 hp more than BMW 6 Series (E63) 645Ci.

The biggest power difference is between BMW 6 Series (E63) 645Ci and BMW 6 Series Gran Turismo (G32) 640i: 7 hp (5 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
BMW6 Series Gran Turismo (G32)640i
450 Nm
332 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
BMW6 Series Gran Turismo (G32)640i
1,835 kg
4,045 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
BMW6 Series Gran Turismo (G32)640i
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
BMW6 Series (E63)645Ci5.6 s
BMW6 Series Gran Turismo (G32)640i5.3 s

The biggest 0-100 km/h difference is between BMW 6 Series Gran Turismo (G32) 640i and BMW 6 Series (E63) 645Ci: 0.3 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
BMW6 Series Gran Turismo (G32)640i
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Gran Turismo (G32) 640i and BMW 6 Series (E63) 645Ci: 3.5 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
BMW6 Series (E63)645Ci
197 hp/t
147 kW/t
5.1 kg/hp
BMW6 Series Gran Turismo (G32)640i
185 hp/t
138 kW/t
5.4 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
598 km
372 mi
BMW6 Series Gran Turismo (G32)640i
829 km
515 mi

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
BMW6 Series Gran Turismo (G32)640i
340 hp
254 kW
5.3 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
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
BMW6 Series Gran Turismo (G32)640i
Power
340 hp
254 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
5 doors
5 seats
Trunk
610 L
21.5 cu ft
Length
5,091 mm
200.4 in
Height
1,540 mm
60.6 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
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
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
BMW6 Series Gran Turismo (G32)640i
Power
340 hp
254 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

BMW 6 Series Gran Turismo (G32) 640i 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
BMW6 Series (E63)645Ci
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
5.6 s
BMW6 Series Gran Turismo (G32)640i
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
5.3 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
BMW6 Series (E63)645Ci
197 hp/t
147 kW/t
5.1 kg/hp
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
BMW6 Series Gran Turismo (G32)640i
185 hp/t
138 kW/t
5.4 kg/hp
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series (E63)645CiBMW6 Series Gran Turismo (G32)640i
Power
333 hp
248 kW
340 hp
254 kW
Torque
450 Nm
332 lb-ft
450 Nm
332 lb-ft
Acceleration
5.6 s
5.3 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,690 kg
3,726 lb
1,835 kg
4,045 lb
Fuel consumption
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
8.2 L/100 km
28.7 mpg US
34.4 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
5 doors
5 seats
Trunk
610 L
21.5 cu ft
Length
5,091 mm
200.4 in
Height
1,540 mm
60.6 in
Range score
598 km
372 mi
829 km
515 mi
CO2 score
283 g/km
187 g/km
Trunk score
450 L
15.9 cu ft
610 L
21.5 cu ft
Power-to-weight score
197 hp/t
147 kW/t
5.1 kg/hp
185 hp/t
138 kW/t
5.4 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) 645CiBMW 6 Series Gran Turismo (G32) 640i
Consumption11.7 L/100 km20.1 mpg US24.1 mpg UK8.2 L/100 km28.7 mpg US34.4 mpg UK
Cost / 100 km20.47 LC100 km14.35 LC100 km
Cost / 100 mi32.95 LC100 mi23.09 LC100 mi
Annual fuel used1,755 L464 US gal386 UK gal1,230 L325 US gal271 UK gal
Annual fuel cost3,071 LC/year2,153 LC/year

Head-to-head comparisons

BMW 6 Series (E63) 645Ci

  • Is 145 kg lighter
  • Has 5 km/h (3 mph) higher top speed
  • Has 12 hp/t better power-to-weight

Pros

  • Highest top speed
  • Highest torque
  • Lightest
  • Best power-to-weight ratio

Cons

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

BMW 6 Series Gran Turismo (G32) 640i

  • Has 7 hp more
  • Is 0.3 s quicker from 0-100 km/h
  • Uses 3.5 L/100 km less fuel
  • Has 231 km (144 mi) more estimated range
  • Has 160 L more trunk volume
  • Emits 96 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Most powerful
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series (E63) 645Ci
BMW 6 Series Gran Turismo (G32) 640i
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2 vehicles selected

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