Car comparison

BMW 8 Series (G15) 840dvsBMW 6 Series Coupe (F13) 640i

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

New comparison

BMW 8 Series (G15)

840d

320 hp2993 ccDieselAWDAutomaticTurbochargedCoupe2018-2020
VS

BMW 6 Series Coupe (F13)

640i

320 hp2979 ccGasolineAWDAutomaticTurbochargedCoupe2013-2015

Comparison overview

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

Best choices

BMW 8 Series (G15) 840d

  • Quickest 0-100 km/h
    4.9 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    320 hp
    239 kW
  • 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
    7.6 L/100 km
    30.9 mpg US
    37.2 mpg UK
  • Lowest highway consumption
    5.4 L/100 km
    43.6 mpg US
    52.3 mpg UK
  • Lowest CO2 emissions
    164 g/km
  • Best estimated range
    1,097 km
    682 mi
  • Best overall score
    67/100
  • Best performance score
    74/100
  • Best economy score
    90/100

BMW 6 Series Coupe (F13) 640i

  • Lightest
    1,765 kg
    3,891 lb
  • Best power-to-weight
    181 hp/t
    135 kW/t
    5.5 kg/hp
  • Largest trunk
    460 L
  • Best practicality score
    54/100

Specification comparison

Specification comparison
ModelBMW8 Series (G15)840dBMW6 Series Coupe (F13)640i
Power
320hp239kW
320hp239kW
Torque
680Nm502lb-ft
450Nm332lb-ft
Curb weight
1,830kg4,034lb
1,765kg3,891lb
Gross weight
2,370kg5,225lb
2,255kg4,971lb
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
71.0s99% target: 262 km/h / 163 mph
Calculated
73.6s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.9s
5.2s
0-200 km/h
17.6s
Calculated
19.1s
Calculated
0-60 mph
4.7s
Calculated
4.9s
Calculated
Fuel consumption
6.2L/100 km37.9mpg US45.6mpg UK
8.2L/100 km28.7mpg US34.4mpg UK
Fuel consumption city
7.6L/100 km30.9mpg US37.2mpg UK
11.2L/100 km21mpg US25.2mpg UK
Fuel consumption highway
5.4L/100 km43.6mpg US52.3mpg UK
6.5L/100 km36.2mpg US43.5mpg UK
Quarter mile
13.0s
Calculated
13.4s
Calculated
Power-to-weight
175hp/t130kW/t79hp/1000 lb
Calculated
181hp/t135kW/t82hp/1000 lb
Calculated
Torque-to-weight
372Nm/t249lb-ft/ton
Calculated
255Nm/t171lb-ft/ton
Calculated
Estimated range
1,097km682mi
Calculated
854km530mi
Calculated
Displacement
2,993cc183cu in
2,979cc182cu in
Length
4,843mm191in
4,894mm193in
Width
1,902mm75in
1,894mm75in
Height
1,341mm53in
1,369mm54in
Wheelbase
2,822mm111in
2,855mm112in
Front track
1,627mm64in
1,600mm63in
Rear track
1,642mm65in
1,665mm66in
Ground clearance
121mm5in
124mm5in
Trunk volume
420L
460L
Doors
2
2
Seats
4
4
Fuel tank
68L
70L
CO2 emissions
164g/km
191g/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 8 Series (G15) 840dBMW 6 Series Coupe (F13) 640iPowerTorque
  • BMW 8 Series (G15) 840d: Power / Torque
  • BMW 6 Series Coupe (F13) 640i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW8 Series (G15)840d4,400 rpm1,750-2,250 rpm4,650 rpm
BMW6 Series Coupe (F13)640i5,800-6,000 rpm1,300-4,500 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW8 Series (G15)840dBMW6 Series Coupe (F13)640i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
4.9 s
0-100 km/h
0-62 mph
4.9 s
5.2 s
0-200 km/h
0-124 mph
17.6 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
2.1 s
2.2 s
330 ft
101 m
5.6 s
5.8 s
1/8 mile
201 m
8.5 s
8.7 s
1000 ft
305 m
11.0 s
11.2 s
1/4 mile
402 m
13.0 s
13.4 s
Trap speed
1/4 mile
402 m
176 km/h
109 mph
172 km/h
107 mph

Power comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840d
320 hp
239 kW
BMW6 Series Coupe (F13)640i
320 hp
239 kW

Torque comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840d
680 Nm
502 lb-ft
BMW6 Series Coupe (F13)640i
450 Nm
332 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840d
1,830 kg
4,034 lb
BMW6 Series Coupe (F13)640i
1,765 kg
3,891 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840d
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
BMW6 Series Coupe (F13)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
BMW8 Series (G15)840d4.9 s
BMW6 Series Coupe (F13)640i5.2 s

The biggest 0-100 km/h difference is between BMW 8 Series (G15) 840d and BMW 6 Series Coupe (F13) 640i: 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
BMW8 Series (G15)840d
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
BMW6 Series Coupe (F13)640i
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

The biggest fuel consumption difference is between BMW 8 Series (G15) 840d and BMW 6 Series Coupe (F13) 640i: 2.0 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
BMW8 Series (G15)840d
175 hp/t
130 kW/t
5.7 kg/hp
BMW6 Series Coupe (F13)640i
181 hp/t
135 kW/t
5.5 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840d
1,097 km
682 mi
BMW6 Series Coupe (F13)640i
854 km
530 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW8 Series (G15)840d
320 hp
239 kW
4.9 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
BMW6 Series Coupe (F13)640i
320 hp
239 kW
5.2 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
BMW8 Series (G15)840d
Power
320 hp
239 kW
0-100 km/h4.9 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
420 L
14.8 cu ft
Length
4,843 mm
190.7 in
Height
1,341 mm
52.8 in
BMW6 Series Coupe (F13)640i
Power
320 hp
239 kW
0-100 km/h5.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
460 L
16.2 cu ft
Length
4,894 mm
192.7 in
Height
1,369 mm
53.9 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
BMW8 Series (G15)840d
Power
320 hp
239 kW
0-100 km/h4.9 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
BMW6 Series Coupe (F13)640i
Power
320 hp
239 kW
0-100 km/h5.2 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 8 Series (G15) 840d 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
BMW8 Series (G15)840d
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
4.9 s
BMW6 Series Coupe (F13)640i
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
5.2 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
BMW8 Series (G15)840d
175 hp/t
130 kW/t
5.7 kg/hp
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
BMW6 Series Coupe (F13)640i
181 hp/t
135 kW/t
5.5 kg/hp
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW8 Series (G15)840dBMW6 Series Coupe (F13)640i
Power
320 hp
239 kW
320 hp
239 kW
Torque
680 Nm
502 lb-ft
450 Nm
332 lb-ft
Acceleration
4.9 s
5.2 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,830 kg
4,034 lb
1,765 kg
3,891 lb
Fuel consumption
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
420 L
14.8 cu ft
Length
4,843 mm
190.7 in
Height
1,341 mm
52.8 in
Doors/seats
2 doors
4 seats
Trunk
460 L
16.2 cu ft
Length
4,894 mm
192.7 in
Height
1,369 mm
53.9 in
Range score
1,097 km
682 mi
854 km
530 mi
CO2 score
164 g/km
191 g/km
Trunk score
420 L
14.8 cu ft
460 L
16.2 cu ft
Power-to-weight score
175 hp/t
130 kW/t
5.7 kg/hp
181 hp/t
135 kW/t
5.5 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 8 Series (G15) 840dBMW 6 Series Coupe (F13) 640i
Consumption6.2 L/100 km37.9 mpg US45.6 mpg UK8.2 L/100 km28.7 mpg US34.4 mpg UK
Cost / 100 km10.85 LC100 km14.35 LC100 km
Cost / 100 mi17.46 LC100 mi23.09 LC100 mi
Annual fuel used930 L246 US gal205 UK gal1,230 L325 US gal271 UK gal
Annual fuel cost1,628 LC/year2,153 LC/year

Head-to-head comparisons

BMW 8 Series (G15) 840d

  • Has 230 Nm more
  • Is 0.3 s quicker from 0-100 km/h
  • Has 5 km/h (3 mph) higher top speed
  • Uses 2.0 L/100 km less fuel
  • Has 243 km (151 mi) more estimated range
  • Emits 27 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Heaviest
  • Smallest trunk

BMW 6 Series Coupe (F13) 640i

  • Is 65 kg lighter
  • Has 6 hp/t better power-to-weight
  • Has 40 L more trunk volume

Pros

  • Lightest
  • Best power-to-weight ratio
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Highest combined fuel consumption
  • Lowest top speed
  • Highest CO2 emissions

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 8 Series (G15) 840d
BMW 6 Series Coupe (F13) 640i
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BMW 8 Series (G15) 840d vs BMW 6 Series Coupe (F13) 640i - car comparison - FastVsFaster