Car comparison

BMW 8 Series (G15) 840dvsBMW X4 (G02) M40d

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 X4 (G02)

M40d

326 hp2993 ccDieselAWDAutomaticTurbocharged2018-2020

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
  • Highest torque
    680 Nm
    502 lb-ft
  • Lightest
    1,830 kg
    4,034 lb
  • Best power-to-weight
    175 hp/t
    130 kW/t
    5.7 kg/hp
  • Lowest combined fuel consumption
    6.2 L/100 km
    37.9 mpg US
    45.6 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 performance score
    74/100
  • Best economy score
    90/100

BMW X4 (G02) M40d

  • Most powerful
    326 hp
    243 kW
  • Lowest city consumption
    7.3 L/100 km
    32.2 mpg US
    38.7 mpg UK
  • Largest trunk
    525 L
  • Best overall score
    73/100
  • Best practicality score
    76/100

Specification comparison

Specification comparison
ModelBMW8 Series (G15)840dBMWX4 (G02)M40d
Power
320hp239kW
326hp243kW
Torque
680Nm502lb-ft
680Nm502lb-ft
Curb weight
1,830kg4,034lb
1,895kg4,178lb
Gross weight
2,370kg5,225lb
2,525kg5,567lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
250 km/h
155 mph
To 99% top speed
70.4s99% target: 262 km/h / 163 mph
Calculated
72.7s99% target: 248 km/h / 154 mph
Calculated
0-100 km/h
4.9s
4.9s
0-200 km/h
17.5s
Calculated
20.0s
Calculated
0-60 mph
4.7s
Calculated
4.6s
Calculated
Fuel consumption
6.2L/100 km37.9mpg US45.6mpg UK
6.6L/100 km35.6mpg US42.8mpg UK
Fuel consumption city
7.6L/100 km30.9mpg US37.2mpg UK
7.3L/100 km32.2mpg US38.7mpg UK
Fuel consumption highway
5.4L/100 km43.6mpg US52.3mpg UK
6.3L/100 km37.3mpg US44.8mpg UK
Quarter mile
13.0s
Calculated
13.2s
Calculated
Power-to-weight
175hp/t130kW/t79hp/1000 lb
Calculated
172hp/t128kW/t78hp/1000 lb
Calculated
Torque-to-weight
372Nm/t249lb-ft/ton
Calculated
359Nm/t240lb-ft/ton
Calculated
Estimated range
1,097km682mi
Calculated
1,030km640mi
Calculated
Displacement
2,993cc183cu in
2,993cc183cu in
Length
4,843mm191in
4,752mm187in
Width
1,902mm75in
1,938mm76in
Height
1,341mm53in
1,621mm64in
Wheelbase
2,822mm111in
2,864mm113in
Front track
1,627mm64in
1,615mm64in
Rear track
1,642mm65in
1,624mm64in
Ground clearance
121mm5in
204mm8in
Trunk volume
420L
525L
Max trunk volume-
1,430L
Doors
2
5
Seats
4
5
Fuel tank
68L
68L
CO2 emissions
164g/km
173g/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 X4 (G02) M40dPowerTorque
  • BMW 8 Series (G15) 840d: Power / Torque
  • BMW X4 (G02) M40d: 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
BMWX4 (G02)M40d4,400 rpm1,750-2,750 rpm4,650 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW8 Series (G15)840dBMWX4 (G02)M40d
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
4.6 s
0-100 km/h
0-62 mph
4.9 s
4.9 s
0-200 km/h
0-124 mph
17.5 s
20.0 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
250 km/h
155 mph
Drag race simulation
60 ft
18 m
2.1 s
2.1 s
330 ft
101 m
5.6 s
5.6 s
1/8 mile
201 m
8.5 s
8.5 s
1000 ft
305 m
11.0 s
11.0 s
1/4 mile
402 m
13.0 s
13.2 s
Trap speed
1/4 mile
402 m
176 km/h
109 mph
170 km/h
106 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
BMWX4 (G02)M40d
326 hp
243 kW

BMW X4 (G02) M40d has 6 hp more than BMW 8 Series (G15) 840d.

The biggest power difference is between BMW 8 Series (G15) 840d and BMW X4 (G02) M40d: 6 hp (4 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
BMWX4 (G02)M40d
680 Nm
502 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
BMWX4 (G02)M40d
1,895 kg
4,178 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
BMWX4 (G02)M40d
250 km/h
155 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
BMWX4 (G02)M40d4.9 s

Although BMW X4 (G02) M40d has more power, BMW 8 Series (G15) 840d is quicker from 0-100 km/h.

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
BMWX4 (G02)M40d
6.6 L/100 km
35.6 mpg US
42.8 mpg UK

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
BMWX4 (G02)M40d
172 hp/t
128 kW/t
5.8 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
BMWX4 (G02)M40d
1,030 km
640 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
BMWX4 (G02)M40d
326 hp
243 kW
4.9 s
250 km/h
155 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
BMWX4 (G02)M40d
Power
326 hp
243 kW
0-100 km/h4.9 s
Top speed
250 km/h
155 mph
Doors/seats
5 doors
5 seats
Trunk
525 L
18.5 cu ft
Length
4,752 mm
187.1 in
Height
1,621 mm
63.8 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
BMWX4 (G02)M40d
Power
326 hp
243 kW
0-100 km/h4.9 s
Top speed
250 km/h
155 mph
6.6 L/100 km
35.6 mpg US
42.8 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
BMWX4 (G02)M40d
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
4.9 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
BMWX4 (G02)M40d
172 hp/t
128 kW/t
5.8 kg/hp
6.6 L/100 km
35.6 mpg US
42.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW8 Series (G15)840dBMWX4 (G02)M40d
Power
320 hp
239 kW
326 hp
243 kW
Torque
680 Nm
502 lb-ft
680 Nm
502 lb-ft
Acceleration
4.9 s
4.9 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
250 km/h
155 mph
Lightness
1,830 kg
4,034 lb
1,895 kg
4,178 lb
Fuel consumption
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
6.6 L/100 km
35.6 mpg US
42.8 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
5 doors
5 seats
Trunk
525 L
18.5 cu ft
Length
4,752 mm
187.1 in
Height
1,621 mm
63.8 in
Range score
1,097 km
682 mi
1,030 km
640 mi
CO2 score
164 g/km
173 g/km
Trunk score
420 L
14.8 cu ft
525 L
18.5 cu ft
Power-to-weight score
175 hp/t
130 kW/t
5.7 kg/hp
172 hp/t
128 kW/t
5.8 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 X4 (G02) M40d
Consumption6.2 L/100 km37.9 mpg US45.6 mpg UK6.6 L/100 km35.6 mpg US42.8 mpg UK
Cost / 100 km10.85 LC100 km11.55 LC100 km
Cost / 100 mi17.46 LC100 mi18.59 LC100 mi
Annual fuel used930 L246 US gal205 UK gal990 L262 US gal218 UK gal
Annual fuel cost1,628 LC/year1,733 LC/year

Head-to-head comparisons

BMW 8 Series (G15) 840d

  • Is 65 kg lighter
  • Has 15 km/h (9 mph) higher top speed
  • Uses 0.4 L/100 km less fuel
  • Has 3 hp/t better power-to-weight
  • Has 66 km (41 mi) more estimated range
  • Emits 9 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Highest torque
  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range

Cons

  • Lowest power
  • Smallest trunk

BMW X4 (G02) M40d

  • Has 6 hp more
  • Has 105 L more trunk volume

Pros

  • Most powerful
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Lowest top speed
  • Highest CO2 emissions

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 8 Series (G15) 840d
BMW X4 (G02) M40d
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2 vehicles selected

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