Car comparison

BMW 6 Series Gran Turismo (G32) 640ivsBMW 6 Series Convertible (E64) 650i

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

New comparison

BMW 6 Series Gran Turismo (G32)

640i

340 hp2998 ccGasolineRWDAutomaticTurbocharged2017-2020
VS

BMW 6 Series Convertible (E64)

650i

367 hp4799 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2005-2007

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
    5.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Lightest
    1,770 kg
    3,902 lb
  • Lowest combined fuel consumption
    7.4 L/100 km
    31.8 mpg US
    38.2 mpg UK
  • Lowest city consumption
    9.8 L/100 km
    24.0 mpg US
    28.8 mpg UK
  • Lowest highway consumption
    6.0 L/100 km
    39.2 mpg US
    47.1 mpg UK
  • Best estimated range
    919 km
    571 mi
  • Largest trunk
    610 L
  • Best overall score
    72/100
  • Best performance score
    69/100
  • Best economy score
    87/100
  • Best practicality score
    79/100

Specification comparison

Specification comparison
ModelBMW6 Series Gran Turismo (G32)640iBMW6 Series Convertible (E64)650i
Power
340hp254kW
367hp274kW
Torque
450Nm332lb-ft
490Nm361lb-ft
Curb weight
1,770kg3,902lb
1,850kg4,079lb
Gross weight
2,450kg5,401lb
2,250kg4,960lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
70.6s99% target: 257 km/h / 160 mph
Calculated
79.1s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.4s
5.7s
0-200 km/h
19.1s
Calculated
20.8s
Calculated
0-60 mph
5.1s
Calculated
5.4s
Calculated
Fuel consumption
7.4L/100 km31.8mpg US38.2mpg UK
12.9L/100 km18.2mpg US21.9mpg UK
Fuel consumption city
9.8L/100 km24mpg US28.8mpg UK
19.1L/100 km12.3mpg US14.8mpg UK
Fuel consumption highway
6L/100 km39.2mpg US47.1mpg UK
9.3L/100 km25.3mpg US30.4mpg UK
Quarter mile
13.5s
Calculated
13.8s
Calculated
Power-to-weight
192hp/t143kW/t87hp/1000 lb
Calculated
198hp/t148kW/t90hp/1000 lb
Calculated
Torque-to-weight
254Nm/t170lb-ft/ton
Calculated
265Nm/t177lb-ft/ton
Calculated
Estimated range
919km571mi
Calculated
543km337mi
Calculated
Displacement
2,998cc183cu in
4,799cc293cu in
Length
5,091mm200in
4,820mm190in
Width
1,902mm75in
1,855mm73in
Height
1,538mm61in
1,373mm54in
Wheelbase
3,070mm121in
2,780mm109in
Front track
1,615mm64in
1,558mm61in
Rear track
1,649mm65in
1,596mm63in
Ground clearance
138mm5in
-
Trunk volume
610L
300L
Max trunk volume
1,800L
350L
Doors
5
2
Seats
5
4
Fuel tank
68L
70L
CO2 emissions
169g/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 Gran Turismo (G32) 640iBMW 6 Series Convertible (E64) 650iPowerTorque
  • BMW 6 Series Gran Turismo (G32) 640i: Power / Torque
  • BMW 6 Series Convertible (E64) 650i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series Gran Turismo (G32)640i5,500-6,500 rpm1,380-5,200 rpm6,750 rpm
BMW6 Series Convertible (E64)650i6,300 rpm3,400 rpm6,550 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series Gran Turismo (G32)640iBMW6 Series Convertible (E64)650i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.4 s
0-100 km/h
0-62 mph
5.4 s
5.7 s
0-200 km/h
0-124 mph
19.1 s
20.8 s
Top speed
Unrestricted
260 km/h162 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
2.3 s
330 ft
101 m
5.9 s
6.0 s
1/8 mile
201 m
8.9 s
9.0 s
1000 ft
305 m
11.4 s
11.6 s
1/4 mile
402 m
13.5 s
13.8 s
Trap speed
1/4 mile
402 m
172 km/h
107 mph
168 km/h
104 mph

Power comparison

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

Chart data table
VehicleValue
BMW6 Series Gran Turismo (G32)640i
340 hp
254 kW
BMW6 Series Convertible (E64)650i
367 hp
274 kW

BMW 6 Series Convertible (E64) 650i has 27 hp more than BMW 6 Series Gran Turismo (G32) 640i.

The biggest power difference is between BMW 6 Series Gran Turismo (G32) 640i and BMW 6 Series Convertible (E64) 650i: 27 hp (20 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW6 Series Gran Turismo (G32)640i
450 Nm
332 lb-ft
BMW6 Series Convertible (E64)650i
490 Nm
361 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW6 Series Gran Turismo (G32)640i
1,770 kg
3,902 lb
BMW6 Series Convertible (E64)650i
1,850 kg
4,079 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 Gran Turismo (G32)640i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)650i
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 Gran Turismo (G32)640i5.4 s
BMW6 Series Convertible (E64)650i5.7 s

Although BMW 6 Series Convertible (E64) 650i has more power, BMW 6 Series Gran Turismo (G32) 640i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 6 Series Gran Turismo (G32) 640i and BMW 6 Series Convertible (E64) 650i: 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 Gran Turismo (G32)640i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
BMW6 Series Convertible (E64)650i
12.9 L/100 km
18.2 mpg US
21.9 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Gran Turismo (G32) 640i and BMW 6 Series Convertible (E64) 650i: 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 Gran Turismo (G32)640i
192 hp/t
143 kW/t
5.2 kg/hp
BMW6 Series Convertible (E64)650i
198 hp/t
148 kW/t
5.0 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW6 Series Gran Turismo (G32)640i
919 km
571 mi
BMW6 Series Convertible (E64)650i
543 km
337 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series Gran Turismo (G32)640i
340 hp
254 kW
5.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)650i
367 hp
274 kW
5.7 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 Gran Turismo (G32)640i
Power
340 hp
254 kW
0-100 km/h5.4 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
1,538 mm
60.6 in
BMW6 Series Convertible (E64)650i
Power
367 hp
274 kW
0-100 km/h5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 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
BMW6 Series Gran Turismo (G32)640i
Power
340 hp
254 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
BMW6 Series Convertible (E64)650i
Power
367 hp
274 kW
0-100 km/h5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
12.9 L/100 km
18.2 mpg US
21.9 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 Gran Turismo (G32)640i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
5.4 s
BMW6 Series Convertible (E64)650i
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
5.7 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 Gran Turismo (G32)640i
192 hp/t
143 kW/t
5.2 kg/hp
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
BMW6 Series Convertible (E64)650i
198 hp/t
148 kW/t
5.0 kg/hp
12.9 L/100 km
18.2 mpg US
21.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series Gran Turismo (G32)640iBMW6 Series Convertible (E64)650i
Power
340 hp
254 kW
367 hp
274 kW
Torque
450 Nm
332 lb-ft
490 Nm
361 lb-ft
Acceleration
5.4 s
5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,770 kg
3,902 lb
1,850 kg
4,079 lb
Fuel consumption
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Practicality
Doors/seats
5 doors
5 seats
Trunk
610 L
21.5 cu ft
Length
5,091 mm
200.4 in
Height
1,538 mm
60.6 in
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
Range score
919 km
571 mi
543 km
337 mi
CO2 score
169 g/km
-
Trunk score
610 L
21.5 cu ft
300 L
10.6 cu ft
Power-to-weight score
192 hp/t
143 kW/t
5.2 kg/hp
198 hp/t
148 kW/t
5.0 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 Gran Turismo (G32) 640iBMW 6 Series Convertible (E64) 650i
Consumption7.4 L/100 km31.8 mpg US38.2 mpg UK12.9 L/100 km18.2 mpg US21.9 mpg UK
Cost / 100 km12.95 LC100 km22.58 LC100 km
Cost / 100 mi20.84 LC100 mi36.33 LC100 mi
Annual fuel used1,110 L293 US gal244 UK gal1,935 L511 US gal426 UK gal
Annual fuel cost1,943 LC/year3,386 LC/year

Head-to-head comparisons

BMW 6 Series Gran Turismo (G32) 640i

  • Is 80 kg lighter
  • Is 0.3 s quicker from 0-100 km/h
  • Uses 5.5 L/100 km less fuel
  • Has 376 km (234 mi) more estimated range
  • Has 310 L more trunk volume

Pros

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

Cons

  • Lowest power

BMW 6 Series Convertible (E64) 650i

  • Has 27 hp more
  • Has 40 Nm more
  • Has 6 hp/t better power-to-weight

Pros

  • Most powerful
  • Highest torque
  • Best power-to-weight ratio

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series Gran Turismo (G32) 640i
BMW 6 Series Convertible (E64) 650i
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