Car comparison

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

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)

640d

320 hp2993 ccDieselAWDAutomaticTurbocharged2017-2020

Comparison overview

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

Best choices

BMW 6 Series Gran Turismo (G32) 640d

  • Quickest 0-100 km/h
    5.3 s
  • Highest torque
    680 Nm
    502 lb-ft
  • Lowest combined fuel consumption
    6.2 L/100 km
    37.9 mpg US
    45.6 mpg UK
  • Lowest city consumption
    7.2 L/100 km
    32.7 mpg US
    39.2 mpg UK
  • Lowest highway consumption
    5.6 L/100 km
    42.0 mpg US
    50.4 mpg UK
  • Lowest CO2 emissions
    163 g/km
  • Best estimated range
    1,065 km
    661 mi
  • Largest trunk
    610 L
  • Best overall score
    74/100
  • Best performance score
    72/100
  • Best economy score
    90/100
  • 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
  • Most powerful
    333 hp
    248 kW
  • Lightest
    1,690 kg
    3,726 lb
  • Best power-to-weight
    197 hp/t
    147 kW/t
    5.1 kg/hp

Specification comparison

Specification comparison
ModelBMW6 Series (E63)645CiBMW6 Series Gran Turismo (G32)640d
Power
333hp248kW
320hp239kW
Torque
450Nm332lb-ft
680Nm502lb-ft
Curb weight
1,690kg3,726lb
1,935kg4,266lb
Gross weight
2,065kg4,553lb
2,615kg5,765lb
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
73.3s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.6s
5.3s
0-200 km/h
19.7s
Calculated
19.3s
Calculated
0-60 mph
5.3s
Calculated
5.0s
Calculated
Fuel consumption
11.7L/100 km20.1mpg US24.1mpg UK
6.2L/100 km37.9mpg US45.6mpg UK
Fuel consumption city
17.2L/100 km13.7mpg US16.4mpg UK
7.2L/100 km32.7mpg US39.2mpg UK
Fuel consumption highway
8.6L/100 km27.4mpg US32.8mpg UK
5.6L/100 km42mpg US50.4mpg UK
Quarter mile
13.7s
Calculated
13.4s
Calculated
Power-to-weight
197hp/t147kW/t89hp/1000 lb
Calculated
165hp/t123kW/t75hp/1000 lb
Calculated
Torque-to-weight
266Nm/t178lb-ft/ton
Calculated
351Nm/t235lb-ft/ton
Calculated
Estimated range
598km372mi
Calculated
1,065km661mi
Calculated
Displacement
4,398cc268cu in
2,993cc183cu 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
-
Rear track
1,592mm63in
-
Trunk volume
450L
610L
Max trunk volume-
1,800L
Doors
2
5
Seats
4
5
Fuel tank
70L
66L
CO2 emissions
283g/km
163g/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) 640dPowerTorque
  • BMW 6 Series (E63) 645Ci: Power / Torque
  • BMW 6 Series Gran Turismo (G32) 640d: 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)640d4,400 rpm1,750-2,250 rpm4,650 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series (E63)645CiBMW6 Series Gran Turismo (G32)640d
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
19.3 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
171 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)640d
320 hp
239 kW

BMW 6 Series (E63) 645Ci has 13 hp more than BMW 6 Series Gran Turismo (G32) 640d.

The biggest power difference is between BMW 6 Series Gran Turismo (G32) 640d 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
BMW6 Series Gran Turismo (G32)640d
680 Nm
502 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)640d
1,935 kg
4,266 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)640d
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)640d5.3 s

Although BMW 6 Series (E63) 645Ci has more power, BMW 6 Series Gran Turismo (G32) 640d is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 6 Series Gran Turismo (G32) 640d 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)640d
6.2 L/100 km
37.9 mpg US
45.6 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Gran Turismo (G32) 640d and BMW 6 Series (E63) 645Ci: 5.5 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)640d
165 hp/t
123 kW/t
6.0 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)640d
1,065 km
661 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)640d
320 hp
239 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)640d
Power
320 hp
239 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)640d
Power
320 hp
239 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
6.2 L/100 km
37.9 mpg US
45.6 mpg UK

BMW 6 Series Gran Turismo (G32) 640d 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)640d
6.2 L/100 km
37.9 mpg US
45.6 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)640d
165 hp/t
123 kW/t
6.0 kg/hp
6.2 L/100 km
37.9 mpg US
45.6 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series (E63)645CiBMW6 Series Gran Turismo (G32)640d
Power
333 hp
248 kW
320 hp
239 kW
Torque
450 Nm
332 lb-ft
680 Nm
502 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
1,935 kg
4,266 lb
Fuel consumption
11.7 L/100 km
20.1 mpg US
24.1 mpg UK
6.2 L/100 km
37.9 mpg US
45.6 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
1,065 km
661 mi
CO2 score
283 g/km
163 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
165 hp/t
123 kW/t
6.0 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) 640d
Consumption11.7 L/100 km20.1 mpg US24.1 mpg UK6.2 L/100 km37.9 mpg US45.6 mpg UK
Cost / 100 km20.47 LC100 km10.85 LC100 km
Cost / 100 mi32.95 LC100 mi17.46 LC100 mi
Annual fuel used1,755 L464 US gal386 UK gal930 L246 US gal205 UK gal
Annual fuel cost3,071 LC/year1,628 LC/year

Head-to-head comparisons

BMW 6 Series (E63) 645Ci

  • Has 13 hp more
  • Is 245 kg lighter
  • Has 5 km/h (3 mph) higher top speed
  • Has 32 hp/t better power-to-weight

Pros

  • Highest top speed
  • Most powerful
  • Lightest
  • Best power-to-weight ratio

Cons

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

BMW 6 Series Gran Turismo (G32) 640d

  • Has 230 Nm more
  • Is 0.3 s quicker from 0-100 km/h
  • Uses 5.5 L/100 km less fuel
  • Has 466 km (290 mi) more estimated range
  • Has 160 L more trunk volume
  • Emits 120 g/km less CO2

Pros

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

Cons

  • Lowest power
  • 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) 640d
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