Car comparison

BMW X4 (G02 LCI) · Facelift 2021 M40dvsBMW 4 Series Convertible (G23) M440d

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

New comparison

BMW X4 (G02 LCI) · Facelift 2021

M40d

340 hp2993 ccDieselAWDAutomaticTurbocharged2021-2025

BMW 4 Series Convertible (G23)

M440d

340 hp2993 ccDieselAWDAutomaticTurbochargedCabriolet / convertible2021-2024

Comparison overview

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

BMW X4 (G02 LCI) Facelift 2021 M40d

Quickest 0-100 km/h
4.9 s
Fastest top speed
260 km/h
162 mph Unrestricted
250 km/h
155 mph Restricted
Most powerful
340 hp
254 kW
Highest torque
700 Nm
516 lb-ft
Best estimated range
932 km
579 mi
Largest trunk
525 L
Best overall score
74/100
Best practicality score
76/100

BMW 4 Series Convertible (G23) M440d

Lightest
1,980 kg
4,365 lb
Best power-to-weight
172 hp/t
128 kW/t
5.8 kg/hp
Lowest combined fuel consumption
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
Best performance score
74/100
Best economy score
89/100

Specification comparison

Specification comparison
Model	BMWX4 (G02 LCI)Facelift 2021M40d	BMW4 Series Convertible (G23)M440d
Power	340hp254kW	340hp254kW
Torque	700Nm516lb-ft	700Nm516lb-ft
Curb weight	2,020kg4,453lb	1,980kg4,365lb
Gross weight	2,560kg5,644lb	2,480kg5,467lb
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	80.4s99% target: 257 km/h / 160 mph Calculated	70.1s99% target: 257 km/h / 160 mph Calculated
0-100 km/h	4.9s	5.0s
0-200 km/h	19.4s Calculated	18.3s Calculated
0-60 mph	4.6s Calculated	4.7s Calculated
Fuel consumption	7.3L/100 km32.2mpg US38.7mpg UK	6.6L/100 km35.6mpg US42.8mpg UK
Quarter mile	13.1s Calculated	13.2s Calculated
Power-to-weight	168hp/t126kW/t76hp/1000 lb Calculated	172hp/t128kW/t78hp/1000 lb Calculated
Torque-to-weight	347Nm/t232lb-ft/ton Calculated	354Nm/t237lb-ft/ton Calculated
Estimated range	932km579mi Calculated	894km555mi Calculated
Displacement	2,993cc183cu in	2,993cc183cu in
Length	4,752mm187in	4,768mm188in
Width	1,938mm76in	1,852mm73in
Height	1,621mm64in	1,384mm54in
Wheelbase	2,864mm113in	2,851mm112in
Front track	1,615mm64in	1,573mm62in
Rear track	1,624mm64in	1,612mm63in
Ground clearance	204mm8in	-
Trunk volume	525L	300L
Max trunk volume	1,430L	385L
Doors	5	2
Seats	5	4
Fuel tank	68L	59L

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 X4 (G02 LCI) Facelift 2021 M40dBMW 4 Series Convertible (G23) M440dPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMWX4 (G02 LCI)Facelift 2021M40d	4,400 rpm	1,750-2,250 rpm	4,650 rpm
BMW4 Series Convertible (G23)M440d	4,400 rpm	1,750-2,250 rpm	4,650 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMWX4 (G02 LCI)Facelift 2021M40d	BMW4 Series Convertible (G23)M440d
	Acceleration checkpoints
0-60 mph 0-97 km/h	4.6 s	4.7 s
0-100 km/h 0-62 mph	4.9 s	5.0 s
0-200 km/h 0-124 mph	19.4 s	18.3 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Limited	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Limited
	Drag race simulation
60 ft 18 m	2.0 s	2.1 s
330 ft 101 m	5.6 s	5.7 s
1/8 mile 201 m	8.5 s	8.6 s
1000 ft 305 m	11.0 s	11.1 s
1/4 mile 402 m	13.1 s	13.2 s
Trap speed 1/4 mile 402 m	171 km/h 106 mph	174 km/h 108 mph

Power comparison

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

Chart data table
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	340 hp 254 kW
BMW4 Series Convertible (G23)M440d	340 hp 254 kW

Torque comparison

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

Chart data table
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	700 Nm 516 lb-ft
BMW4 Series Convertible (G23)M440d	700 Nm 516 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	2,020 kg 4,453 lb
BMW4 Series Convertible (G23)M440d	1,980 kg 4,365 lb

Top speed without limiter comparison

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

Chart data table
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
BMW4 Series Convertible (G23)M440d	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
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	4.9 s
BMW4 Series Convertible (G23)M440d	5.0 s

The biggest 0-100 km/h difference is between BMW X4 (G02 LCI) Facelift 2021 M40d and BMW 4 Series Convertible (G23) M440d: 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
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	7.3 L/100 km 32.2 mpg US 38.7 mpg UK
BMW4 Series Convertible (G23)M440d	6.6 L/100 km 35.6 mpg US 42.8 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) M440d and BMW X4 (G02 LCI) Facelift 2021 M40d: 0.7 L/100 km.

Power-to-weight comparison

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

Chart data table
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	168 hp/t 126 kW/t 5.9 kg/hp
BMW4 Series Convertible (G23)M440d	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
Vehicle	Value
BMWX4 (G02 LCI)Facelift 2021M40d	932 km 579 mi
BMW4 Series Convertible (G23)M440d	894 km 555 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMWX4 (G02 LCI)Facelift 2021M40d	340 hp 254 kW	4.9 s	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
BMW4 Series Convertible (G23)M440d	340 hp 254 kW	5.0 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.

Vehicle

Performance score

Practicality score

BMWX4 (G02 LCI)Facelift 2021M40d

Power	340 hp 254 kW
0-100 km/h	4.9 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 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

BMW4 Series Convertible (G23)M440d

Power	340 hp 254 kW
0-100 km/h	5.0 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	4,768 mm 187.7 in
Height	1,384 mm 54.5 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Vehicle

Performance score

Fuel economy score

BMWX4 (G02 LCI)Facelift 2021M40d

Power	340 hp 254 kW
0-100 km/h	4.9 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

7.3 L/100 km

32.2 mpg US

38.7 mpg UK

BMW4 Series Convertible (G23)M440d

Power	340 hp 254 kW
0-100 km/h	5.0 s
Top speed Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph

6.6 L/100 km

35.6 mpg US

42.8 mpg UK

BMW 4 Series Convertible (G23) M440d 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
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
BMWX4 (G02 LCI)Facelift 2021M40d	7.3 L/100 km 32.2 mpg US 38.7 mpg UK	4.9 s
BMW4 Series Convertible (G23)M440d	6.6 L/100 km 35.6 mpg US 42.8 mpg UK	5.0 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
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
BMWX4 (G02 LCI)Facelift 2021M40d	168 hp/t 126 kW/t 5.9 kg/hp	7.3 L/100 km 32.2 mpg US 38.7 mpg UK
BMW4 Series Convertible (G23)M440d	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

Vehicle

BMWX4 (G02 LCI)Facelift 2021M40d

BMW4 Series Convertible (G23)M440d

Power

340 hp

254 kW

340 hp

254 kW

Torque

700 Nm

516 lb-ft

700 Nm

516 lb-ft

Acceleration

4.9 s

5.0 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

Lightness

2,020 kg

4,453 lb

1,980 kg

4,365 lb

Fuel consumption

7.3 L/100 km

32.2 mpg US

38.7 mpg UK

6.6 L/100 km

35.6 mpg US

42.8 mpg UK

Practicality

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

Doors/seats	2 doors 4 seats
Trunk	300 L 10.6 cu ft
Length	4,768 mm 187.7 in
Height	1,384 mm 54.5 in

Range score

932 km

579 mi

894 km

555 mi

Trunk score

525 L

18.5 cu ft

300 L

10.6 cu ft

Power-to-weight score

168 hp/t

126 kW/t

5.9 kg/hp

172 hp/t

128 kW/t

5.8 kg/hp

Overall

Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Average annual distanceDistance unitFuel price in your local currencyPrice unit

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
Vehicle	BMW X4 (G02 LCI) Facelift 2021 M40d	BMW 4 Series Convertible (G23) M440d
Consumption	7.3 L/100 km32.2 mpg US38.7 mpg UK	6.6 L/100 km35.6 mpg US42.8 mpg UK
Cost / 100 km	12.78 LC100 km	11.55 LC100 km
Cost / 100 mi	20.56 LC100 mi	18.59 LC100 mi
Annual fuel used	1,095 L289 US gal241 UK gal	990 L262 US gal218 UK gal
Annual fuel cost	1,916 LC/year	1,733 LC/year