Car comparison

BMW 6 Series Convertible (E64) 645CivsBMW 6 Series (E63) · Facelift 2007 630i

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

New comparison

BMW 6 Series Convertible (E64)

645Ci

333 hp4398 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2003-2005
VS

BMW 6 Series (E63) · Facelift 2007

630i

272 hp2996 ccGasolineRWDManualNaturally aspiratedCoupe2007-2010

Comparison overview

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

Best choices

BMW 6 Series (E63) Facelift 2007 630i

  • Lightest
    1,530 kg
    3,373 lb
  • Lowest combined fuel consumption
    7.9 L/100 km
    29.8 mpg US
    35.8 mpg UK
  • Lowest city consumption
    11.2 L/100 km
    21.0 mpg US
    25.2 mpg UK
  • Lowest highway consumption
    6.0 L/100 km
    39.2 mpg US
    47.1 mpg UK
  • Best estimated range
    886 km
    551 mi
  • Largest trunk
    450 L
  • Best economy score
    86/100
  • Best practicality score
    53/100

BMW 6 Series Convertible (E64) 645Ci

  • Quickest 0-100 km/h
    6.2 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    333 hp
    248 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Best power-to-weight
    183 hp/t
    136 kW/t
    5.5 kg/hp
  • Best overall score
    59/100
  • Best performance score
    65/100

Specification comparison

Specification comparison
ModelBMW6 Series Convertible (E64)645CiBMW6 Series (E63)Facelift 2007630i
Power
333hp248kW
272hp203kW
Torque
450Nm332lb-ft
320Nm236lb-ft
Curb weight
1,820kg4,012lb
1,530kg3,373lb
Gross weight
2,220kg4,894lb
1,980kg4,365lb
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
87.8s99% target: 257 km/h / 160 mph
Calculated
84.9s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
6.2s
6.2s
0-200 km/h
22.8s
Calculated
22.4s
Calculated
0-60 mph
5.9s
Calculated
5.9s
Calculated
Fuel consumption
11.5L/100 km20.5mpg US24.6mpg UK
7.9L/100 km29.8mpg US35.8mpg UK
Fuel consumption city
16.8L/100 km14mpg US16.8mpg UK
11.2L/100 km21mpg US25.2mpg UK
Fuel consumption highway
8.5L/100 km27.7mpg US33.2mpg UK
6L/100 km39.2mpg US47.1mpg UK
Quarter mile
14.3s
Calculated
14.3s
Calculated
Power-to-weight
183hp/t136kW/t83hp/1000 lb
Calculated
178hp/t133kW/t81hp/1000 lb
Calculated
Torque-to-weight
247Nm/t165lb-ft/ton
Calculated
209Nm/t140lb-ft/ton
Calculated
Estimated range
609km378mi
Calculated
886km551mi
Calculated
Displacement
4,398cc268cu in
2,996cc183cu in
Length
4,820mm190in
4,820mm190in
Width
1,855mm73in
1,855mm73in
Height
1,373mm54in
1,374mm54in
Wheelbase
2,780mm109in
2,780mm109in
Front track
1,558mm61in
1,558mm61in
Rear track
1,592mm63in
1,596mm63in
Trunk volume
300L
450L
Max trunk volume
350L
-
Doors
2
2
Seats
4
4
Fuel tank
70L
70L

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 Convertible (E64) 645CiBMW 6 Series (E63) Facelift 2007 630iPowerTorque
  • BMW 6 Series Convertible (E64) 645Ci: Power / Torque
  • BMW 6 Series (E63) Facelift 2007 630i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series Convertible (E64)645Ci6,100 rpm3,600 rpm6,350 rpm
BMW6 Series (E63)Facelift 2007630i6,700 rpm2,750-3,000 rpm6,950 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series Convertible (E64)645CiBMW6 Series (E63)Facelift 2007630i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.9 s
5.9 s
0-100 km/h
0-62 mph
6.2 s
6.2 s
0-200 km/h
0-124 mph
22.8 s
22.4 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
Limited
Drag race simulation
60 ft
18 m
2.4 s
2.4 s
330 ft
101 m
6.2 s
6.2 s
1/8 mile
201 m
9.3 s
9.4 s
1000 ft
305 m
12.0 s
12.0 s
1/4 mile
402 m
14.3 s
14.3 s
Trap speed
1/4 mile
402 m
163 km/h
101 mph
164 km/h
102 mph

Power comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW
BMW6 Series (E63)Facelift 2007630i
272 hp
203 kW

BMW 6 Series Convertible (E64) 645Ci has 61 hp more than BMW 6 Series (E63) Facelift 2007 630i.

The biggest power difference is between BMW 6 Series (E63) Facelift 2007 630i and BMW 6 Series Convertible (E64) 645Ci: 61 hp (45 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
450 Nm
332 lb-ft
BMW6 Series (E63)Facelift 2007630i
320 Nm
236 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
1,820 kg
4,012 lb
BMW6 Series (E63)Facelift 2007630i
1,530 kg
3,373 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 Convertible (E64)645Ci
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series (E63)Facelift 2007630i
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 Convertible (E64)645Ci6.2 s
BMW6 Series (E63)Facelift 2007630i6.2 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 Convertible (E64)645Ci
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
BMW6 Series (E63)Facelift 2007630i
7.9 L/100 km
29.8 mpg US
35.8 mpg UK

The biggest fuel consumption difference is between BMW 6 Series (E63) Facelift 2007 630i and BMW 6 Series Convertible (E64) 645Ci: 3.6 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
BMW6 Series Convertible (E64)645Ci
183 hp/t
136 kW/t
5.5 kg/hp
BMW6 Series (E63)Facelift 2007630i
178 hp/t
133 kW/t
5.6 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW6 Series Convertible (E64)645Ci
609 km
378 mi
BMW6 Series (E63)Facelift 2007630i
886 km
551 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW
6.2 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series (E63)Facelift 2007630i
272 hp
203 kW
6.2 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 Convertible (E64)645Ci
Power
333 hp
248 kW
0-100 km/h6.2 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
BMW6 Series (E63)Facelift 2007630i
Power
272 hp
203 kW
0-100 km/h6.2 s
Top speed
Unrestricted
260 km/h162 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
1,374 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 Convertible (E64)645Ci
Power
333 hp
248 kW
0-100 km/h6.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
BMW6 Series (E63)Facelift 2007630i
Power
272 hp
203 kW
0-100 km/h6.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.9 L/100 km
29.8 mpg US
35.8 mpg UK

BMW 6 Series (E63) Facelift 2007 630i 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 Convertible (E64)645Ci
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
6.2 s
BMW6 Series (E63)Facelift 2007630i
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
6.2 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 Convertible (E64)645Ci
183 hp/t
136 kW/t
5.5 kg/hp
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
BMW6 Series (E63)Facelift 2007630i
178 hp/t
133 kW/t
5.6 kg/hp
7.9 L/100 km
29.8 mpg US
35.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series Convertible (E64)645CiBMW6 Series (E63)Facelift 2007630i
Power
333 hp
248 kW
272 hp
203 kW
Torque
450 Nm
332 lb-ft
320 Nm
236 lb-ft
Acceleration
6.2 s
6.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,820 kg
4,012 lb
1,530 kg
3,373 lb
Fuel consumption
11.5 L/100 km
20.5 mpg US
24.6 mpg UK
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
Practicality
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
Doors/seats
2 doors
4 seats
Trunk
450 L
15.9 cu ft
Length
4,820 mm
189.8 in
Height
1,374 mm
54.1 in
Range score
609 km
378 mi
886 km
551 mi
Trunk score
300 L
10.6 cu ft
450 L
15.9 cu ft
Power-to-weight score
183 hp/t
136 kW/t
5.5 kg/hp
178 hp/t
133 kW/t
5.6 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 Convertible (E64) 645CiBMW 6 Series (E63) Facelift 2007 630i
Consumption11.5 L/100 km20.5 mpg US24.6 mpg UK7.9 L/100 km29.8 mpg US35.8 mpg UK
Cost / 100 km20.13 LC100 km13.83 LC100 km
Cost / 100 mi32.39 LC100 mi22.25 LC100 mi
Annual fuel used1,725 L456 US gal379 UK gal1,185 L313 US gal261 UK gal
Annual fuel cost3,019 LC/year2,074 LC/year

Head-to-head comparisons

BMW 6 Series Convertible (E64) 645Ci

  • Has 61 hp more
  • Has 130 Nm more
  • Has 5 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Smallest trunk

BMW 6 Series (E63) Facelift 2007 630i

  • Is 290 kg lighter
  • Uses 3.6 L/100 km less fuel
  • Has 277 km (172 mi) more estimated range
  • Has 150 L more trunk volume

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Lowest power

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series Convertible (E64) 645Ci
BMW 6 Series (E63) 630i
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