Car comparison

BMW 2 Series Convertible (F23) M240ivsBMW X4 (F26) M40i

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

New comparison

BMW 2 Series Convertible (F23)

M240i

340 hp2998 ccGasolineRWDManualTurbochargedCabriolet / convertible2016-2017
VS

BMW X4 (F26)

M40i

360 hp2979 ccGasolineAWDAutomaticTurbocharged2015-2018

Comparison overview

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

Best choices

BMW 2 Series Convertible (F23) M240i

  • Quickest 0-100 km/h
    4.9 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Highest torque
    500 Nm
    369 lb-ft
  • Lightest
    1,615 kg
    3,560 lb
  • Best power-to-weight
    211 hp/t
    157 kW/t
    4.8 kg/hp
  • Lowest combined fuel consumption
    8.3 L/100 km
    28.3 mpg US
    34.0 mpg UK
  • Lowest city consumption
    11.2 L/100 km
    21.0 mpg US
    25.2 mpg UK
  • Lowest highway consumption
    6.6 L/100 km
    35.6 mpg US
    42.8 mpg UK
  • Lowest CO2 emissions
    189 g/km
  • Best performance score
    70/100
  • Best economy score
    85/100

BMW X4 (F26) M40i

  • Most powerful
    360 hp
    268 kW
  • Best estimated range
    779 km
    484 mi
  • Largest trunk
    500 L
  • Best overall score
    71/100
  • Best practicality score
    75/100

Specification comparison

Specification comparison
ModelBMW2 Series Convertible (F23)M240iBMWX4 (F26)M40i
Power
340hp254kW
360hp268kW
Torque
500Nm369lb-ft
465Nm343lb-ft
Curb weight
1,615kg3,560lb
1,765kg3,891lb
Gross weight
2,045kg4,508lb
2,430kg5,357lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
250 km/h
155 mph
To 99% top speed
69.3s99% target: 257 km/h / 160 mph
Calculated
72.2s99% target: 248 km/h / 154 mph
Calculated
0-100 km/h
4.9s
4.9s
0-200 km/h
18.0s
Calculated
20.0s
Calculated
0-60 mph
4.7s
Calculated
4.6s
Calculated
Fuel consumption
8.3L/100 km28.3mpg US34.0mpg UK
8.6L/100 km27.4mpg US32.8mpg UK
Fuel consumption city
11.2L/100 km21mpg US25.2mpg UK
11.3L/100 km20.8mpg US25.0mpg UK
Fuel consumption highway
6.6L/100 km35.6mpg US42.8mpg UK
7L/100 km33.6mpg US40.4mpg UK
Quarter mile
13.1s
Calculated
13.2s
Calculated
Power-to-weight
211hp/t157kW/t95hp/1000 lb
Calculated
204hp/t152kW/t93hp/1000 lb
Calculated
Torque-to-weight
310Nm/t207lb-ft/ton
Calculated
263Nm/t176lb-ft/ton
Calculated
Estimated range
627km389mi
Calculated
779km484mi
Calculated
Displacement
2,998cc183cu in
2,979cc182cu in
Length
4,454mm175in
4,671mm184in
Width
1,774mm70in
1,901mm75in
Height
1,403mm55in
1,624mm64in
Wheelbase
2,690mm106in
2,810mm111in
Front track
1,516mm60in
1,610mm63in
Rear track
1,534mm60in
1,600mm63in
Ground clearance
130mm5in
204mm8in
Trunk volume
280L
500L
Max trunk volume
335L
1,400L
Doors
2
5
Seats
4
5
Fuel tank
52L
67L
CO2 emissions
189g/km
199g/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 2 Series Convertible (F23) M240iBMW X4 (F26) M40iPowerTorque
  • BMW 2 Series Convertible (F23) M240i: Power / Torque
  • BMW X4 (F26) M40i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW2 Series Convertible (F23)M240i5,500 rpm1,520-4,500 rpm5,750 rpm
BMWX4 (F26)M40i5,800-6,000 rpm1,350-5,250 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW2 Series Convertible (F23)M240iBMWX4 (F26)M40i
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
18.0 s
20.0 s
Top speed
Unrestricted
260 km/h162 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
13.1 s
13.2 s
Trap speed
1/4 mile
402 m
175 km/h
109 mph
171 km/h
106 mph

Power comparison

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

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M240i
340 hp
254 kW
BMWX4 (F26)M40i
360 hp
268 kW

BMW X4 (F26) M40i has 20 hp more than BMW 2 Series Convertible (F23) M240i.

The biggest power difference is between BMW 2 Series Convertible (F23) M240i and BMW X4 (F26) M40i: 20 hp (15 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M240i
500 Nm
369 lb-ft
BMWX4 (F26)M40i
465 Nm
343 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M240i
1,615 kg
3,560 lb
BMWX4 (F26)M40i
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
BMW2 Series Convertible (F23)M240i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWX4 (F26)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
BMW2 Series Convertible (F23)M240i4.9 s
BMWX4 (F26)M40i4.9 s

Although BMW X4 (F26) M40i has more power, BMW 2 Series Convertible (F23) M240i 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
BMW2 Series Convertible (F23)M240i
8.3 L/100 km
28.3 mpg US
34.0 mpg UK
BMWX4 (F26)M40i
8.6 L/100 km
27.4 mpg US
32.8 mpg UK

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M240i
211 hp/t
157 kW/t
4.7 kg/hp
BMWX4 (F26)M40i
204 hp/t
152 kW/t
4.9 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M240i
627 km
389 mi
BMWX4 (F26)M40i
779 km
484 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW2 Series Convertible (F23)M240i
340 hp
254 kW
4.9 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWX4 (F26)M40i
360 hp
268 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
BMW2 Series Convertible (F23)M240i
Power
340 hp
254 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,454 mm
175.4 in
Height
1,403 mm
55.2 in
BMWX4 (F26)M40i
Power
360 hp
268 kW
0-100 km/h4.9 s
Top speed
250 km/h
155 mph
Doors/seats
5 doors
5 seats
Trunk
500 L
17.7 cu ft
Length
4,671 mm
183.9 in
Height
1,624 mm
63.9 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
BMW2 Series Convertible (F23)M240i
Power
340 hp
254 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.3 L/100 km
28.3 mpg US
34.0 mpg UK
BMWX4 (F26)M40i
Power
360 hp
268 kW
0-100 km/h4.9 s
Top speed
250 km/h
155 mph
8.6 L/100 km
27.4 mpg US
32.8 mpg UK

BMW 2 Series Convertible (F23) M240i 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
BMW2 Series Convertible (F23)M240i
8.3 L/100 km
28.3 mpg US
34.0 mpg UK
4.9 s
BMWX4 (F26)M40i
8.6 L/100 km
27.4 mpg US
32.8 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
BMW2 Series Convertible (F23)M240i
211 hp/t
157 kW/t
4.8 kg/hp
8.3 L/100 km
28.3 mpg US
34.0 mpg UK
BMWX4 (F26)M40i
204 hp/t
152 kW/t
4.9 kg/hp
8.6 L/100 km
27.4 mpg US
32.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW2 Series Convertible (F23)M240iBMWX4 (F26)M40i
Power
340 hp
254 kW
360 hp
268 kW
Torque
500 Nm
369 lb-ft
465 Nm
343 lb-ft
Acceleration
4.9 s
4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
250 km/h
155 mph
Lightness
1,615 kg
3,560 lb
1,765 kg
3,891 lb
Fuel consumption
8.3 L/100 km
28.3 mpg US
34.0 mpg UK
8.6 L/100 km
27.4 mpg US
32.8 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,454 mm
175.4 in
Height
1,403 mm
55.2 in
Doors/seats
5 doors
5 seats
Trunk
500 L
17.7 cu ft
Length
4,671 mm
183.9 in
Height
1,624 mm
63.9 in
Range score
627 km
389 mi
779 km
484 mi
CO2 score
189 g/km
199 g/km
Trunk score
280 L
9.9 cu ft
500 L
17.7 cu ft
Power-to-weight score
211 hp/t
157 kW/t
4.8 kg/hp
204 hp/t
152 kW/t
4.9 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 2 Series Convertible (F23) M240iBMW X4 (F26) M40i
Consumption8.3 L/100 km28.3 mpg US34 mpg UK8.6 L/100 km27.4 mpg US32.8 mpg UK
Cost / 100 km14.53 LC100 km15.05 LC100 km
Cost / 100 mi23.38 LC100 mi24.22 LC100 mi
Annual fuel used1,245 L329 US gal274 UK gal1,290 L341 US gal284 UK gal
Annual fuel cost2,179 LC/year2,258 LC/year

Head-to-head comparisons

BMW 2 Series Convertible (F23) M240i

  • Has 35 Nm more
  • Is 150 kg lighter
  • Has 10 km/h (6 mph) higher top speed
  • Uses 0.3 L/100 km less fuel
  • Has 7 hp/t better power-to-weight
  • Emits 10 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

Cons

  • Lowest power
  • Smallest trunk

BMW X4 (F26) M40i

  • Has 20 hp more
  • Has 153 km (95 mi) more estimated range
  • Has 220 L more trunk volume

Pros

  • Most powerful
  • Best estimated range
  • 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 2 Series Convertible (F23) M240i
BMW X4 (F26) M40i
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