Car comparison

BMW 8 Series (G15) 840ivsBMW X3 (G01) M40i

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

New comparison

BMW 8 Series (G15)

840i

340 hp2998 ccGasolineAWDAutomaticTurbochargedCoupe2019-2020
VS

BMW X3 (G01)

M40i

360 hp2998 ccGasolineAWDAutomaticTurbocharged2019-2021

Comparison overview

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

Best choices

BMW 8 Series (G15) 840i

  • Quickest 0-100 km/h
    4.7 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Highest torque
    500 Nm
    369 lb-ft
  • Lightest
    1,770 kg
    3,902 lb
  • Lowest combined fuel consumption
    7.7 L/100 km
    30.5 mpg US
    36.7 mpg UK
  • Lowest city consumption
    9.6 L/100 km
    24.5 mpg US
    29.4 mpg UK
  • Lowest highway consumption
    6.5 L/100 km
    36.2 mpg US
    43.5 mpg UK
  • Best estimated range
    883 km
    549 mi
  • Best performance score
    72/100
  • Best economy score
    86/100

BMW X3 (G01) M40i

  • Most powerful
    360 hp
    268 kW
  • Best power-to-weight
    195 hp/t
    146 kW/t
    5.1 kg/hp
  • Largest trunk
    550 L
  • Best overall score
    72/100
  • Best practicality score
    77/100

Specification comparison

Specification comparison
ModelBMW8 Series (G15)840iBMWX3 (G01)M40i
Power
340hp254kW
360hp268kW
Torque
500Nm369lb-ft
500Nm369lb-ft
Curb weight
1,770kg3,902lb
1,845kg4,068lb
Gross weight
2,280kg5,027lb
2,455kg5,412lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
250 km/h
155 mph
To 99% top speed
66.4s99% target: 262 km/h / 163 mph
Calculated
69.7s99% target: 248 km/h / 154 mph
Calculated
0-100 km/h
4.7s
4.8s
0-200 km/h
16.7s
Calculated
19.4s
Calculated
0-60 mph
4.5s
Calculated
4.5s
Calculated
Fuel consumption
7.7L/100 km30.5mpg US36.7mpg UK
8.2L/100 km28.7mpg US34.4mpg UK
Fuel consumption city
9.6L/100 km24.5mpg US29.4mpg UK
10.1L/100 km23.3mpg US28.0mpg UK
Fuel consumption highway
6.5L/100 km36.2mpg US43.5mpg UK
7.2L/100 km32.7mpg US39.2mpg UK
Quarter mile
12.8s
Calculated
13.1s
Calculated
Power-to-weight
192hp/t143kW/t87hp/1000 lb
Calculated
195hp/t146kW/t89hp/1000 lb
Calculated
Torque-to-weight
282Nm/t189lb-ft/ton
Calculated
271Nm/t181lb-ft/ton
Calculated
Estimated range
883km549mi
Calculated
793km493mi
Calculated
Displacement
2,998cc183cu in
2,998cc183cu in
Length
4,843mm191in
4,716mm186in
Width
1,902mm75in
1,897mm75in
Height
1,341mm53in
1,676mm66in
Wheelbase
2,822mm111in
2,864mm113in
Front track
1,627mm64in
1,615mm64in
Rear track
1,642mm65in
1,594mm63in
Ground clearance
121mm5in
204mm8in
Trunk volume
420L
550L
Max trunk volume-
1,600L
Doors
2
5
Seats
4
5
Fuel tank
68L
65L
CO2 emissions-
187g/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) 840iBMW X3 (G01) M40iPowerTorque
  • BMW 8 Series (G15) 840i: Power / Torque
  • BMW X3 (G01) M40i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW8 Series (G15)840i5,000-6,500 rpm1,600-4,500 rpm6,750 rpm
BMWX3 (G01)M40i5,200-6,500 rpm1,850-5,000 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW8 Series (G15)840iBMWX3 (G01)M40i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.5 s
4.5 s
0-100 km/h
0-62 mph
4.7 s
4.8 s
0-200 km/h
0-124 mph
16.7 s
19.4 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
2.0 s
330 ft
101 m
5.6 s
5.5 s
1/8 mile
201 m
8.4 s
8.4 s
1000 ft
305 m
10.8 s
10.9 s
1/4 mile
402 m
12.8 s
13.1 s
Trap speed
1/4 mile
402 m
179 km/h
111 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)840i
340 hp
254 kW
BMWX3 (G01)M40i
360 hp
268 kW

BMW X3 (G01) M40i has 20 hp more than BMW 8 Series (G15) 840i.

The biggest power difference is between BMW 8 Series (G15) 840i and BMW X3 (G01) M40i: 20 hp (15 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840i
500 Nm
369 lb-ft
BMWX3 (G01)M40i
500 Nm
369 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840i
1,770 kg
3,902 lb
BMWX3 (G01)M40i
1,845 kg
4,068 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)840i
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
BMWX3 (G01)M40i
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)840i4.7 s
BMWX3 (G01)M40i4.8 s

Although BMW X3 (G01) M40i has more power, BMW 8 Series (G15) 840i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW 8 Series (G15) 840i and BMW X3 (G01) M40i: 0.1 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)840i
7.7 L/100 km
30.5 mpg US
36.7 mpg UK
BMWX3 (G01)M40i
8.2 L/100 km
28.7 mpg US
34.4 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)840i
192 hp/t
143 kW/t
5.2 kg/hp
BMWX3 (G01)M40i
195 hp/t
146 kW/t
5.1 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW8 Series (G15)840i
883 km
549 mi
BMWX3 (G01)M40i
793 km
493 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW8 Series (G15)840i
340 hp
254 kW
4.7 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
BMWX3 (G01)M40i
360 hp
268 kW
4.8 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)840i
Power
340 hp
254 kW
0-100 km/h4.7 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
BMWX3 (G01)M40i
Power
360 hp
268 kW
0-100 km/h4.8 s
Top speed
250 km/h
155 mph
Doors/seats
5 doors
5 seats
Trunk
550 L
19.4 cu ft
Length
4,716 mm
185.7 in
Height
1,676 mm
66.0 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)840i
Power
340 hp
254 kW
0-100 km/h4.7 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
7.7 L/100 km
30.5 mpg US
36.7 mpg UK
BMWX3 (G01)M40i
Power
360 hp
268 kW
0-100 km/h4.8 s
Top speed
250 km/h
155 mph
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

BMW 8 Series (G15) 840i 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)840i
7.7 L/100 km
30.5 mpg US
36.7 mpg UK
4.7 s
BMWX3 (G01)M40i
8.2 L/100 km
28.7 mpg US
34.4 mpg UK
4.8 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)840i
192 hp/t
143 kW/t
5.2 kg/hp
7.7 L/100 km
30.5 mpg US
36.7 mpg UK
BMWX3 (G01)M40i
195 hp/t
146 kW/t
5.1 kg/hp
8.2 L/100 km
28.7 mpg US
34.4 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW8 Series (G15)840iBMWX3 (G01)M40i
Power
340 hp
254 kW
360 hp
268 kW
Torque
500 Nm
369 lb-ft
500 Nm
369 lb-ft
Acceleration
4.7 s
4.8 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
250 km/h
155 mph
Lightness
1,770 kg
3,902 lb
1,845 kg
4,068 lb
Fuel consumption
7.7 L/100 km
30.5 mpg US
36.7 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
5 doors
5 seats
Trunk
550 L
19.4 cu ft
Length
4,716 mm
185.7 in
Height
1,676 mm
66.0 in
Range score
883 km
549 mi
793 km
493 mi
CO2 score
-
187 g/km
Trunk score
420 L
14.8 cu ft
550 L
19.4 cu ft
Power-to-weight score
192 hp/t
143 kW/t
5.2 kg/hp
195 hp/t
146 kW/t
5.1 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) 840iBMW X3 (G01) M40i
Consumption7.7 L/100 km30.5 mpg US36.7 mpg UK8.2 L/100 km28.7 mpg US34.4 mpg UK
Cost / 100 km13.48 LC100 km14.35 LC100 km
Cost / 100 mi21.69 LC100 mi23.09 LC100 mi
Annual fuel used1,155 L305 US gal254 UK gal1,230 L325 US gal271 UK gal
Annual fuel cost2,021 LC/year2,153 LC/year

Head-to-head comparisons

BMW 8 Series (G15) 840i

  • Is 75 kg lighter
  • Is 0.1 s quicker from 0-100 km/h
  • Has 15 km/h (9 mph) higher top speed
  • Uses 0.5 L/100 km less fuel
  • Has 90 km (56 mi) more estimated range

Pros

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

Cons

  • Lowest power
  • Smallest trunk

BMW X3 (G01) M40i

  • Has 20 hp more
  • Has 3 hp/t better power-to-weight
  • Has 130 L more trunk volume

Pros

  • Most powerful
  • Best power-to-weight ratio
  • Largest trunk

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 8 Series (G15) 840i
BMW X3 (G01) M40i
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