Car comparison

BMW 4 Series Convertible (G23) 420ivsMini Convertible (F57) · Facelift 2021 Cooper 1.5

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

New comparison

BMW 4 Series Convertible (G23)

420i

184 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2020-2024

Mini Convertible (F57) · Facelift 2021

Cooper 1.5

136 hp1499 ccGasolineFWDAutomaticTurbochargedCabriolet / convertible2021-2024

Comparison overview

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

BMW 4 Series Convertible (G23) 420i

Quickest 0-100 km/h
8.2 s
Fastest top speed
236 km/h
147 mph
Most powerful
184 hp
137 kW
Highest torque
300 Nm
221 lb-ft
Best power-to-weight
109 hp/t
81 kW/t
9.2 kg/hp
Best estimated range
967 km
601 mi
Largest trunk
300 L
Best overall score
47/100
Best performance score
48/100
Best practicality score
45/100

Mini Convertible (F57) Facelift 2021 Cooper 1.5

Lightest
1,285 kg
2,833 lb
Lowest combined fuel consumption
5.4 L/100 km
43.6 mpg US
52.3 mpg UK
Lowest city consumption
6.5 L/100 km
36.2 mpg US
43.5 mpg UK
Lowest highway consumption
4.8 L/100 km
49.0 mpg US
58.9 mpg UK
Best economy score
92/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (G23)420i	MiniConvertible (F57)Facelift 2021Cooper 1.5
Power	184hp137kW	136hp101kW
Torque	300Nm221lb-ft	220Nm162lb-ft
Curb weight	1,690kg3,726lb	1,285kg2,833lb
Gross weight	2,185kg4,817lb	1,715kg3,781lb
Top speed	236 km/h 147 mph	205 km/h 127 mph
To 99% top speed	107.2s99% target: 234 km/h / 145 mph Calculated	93.9s99% target: 203 km/h / 126 mph Calculated
0-100 km/h	8.2s	8.7s
0-200 km/h	36.3s Calculated	72.0s Calculated
0-60 mph	7.8s Calculated	8.2s Calculated
Fuel consumption	6.1L/100 km38.6mpg US46.3mpg UK	5.4L/100 km43.6mpg US52.3mpg UK
Fuel consumption city	7.4L/100 km31.8mpg US38.2mpg UK	6.5L/100 km36.2mpg US43.5mpg UK
Fuel consumption highway	5.4L/100 km43.6mpg US52.3mpg UK	4.8L/100 km49mpg US58.9mpg UK
Quarter mile	15.9s Calculated	16.3s Calculated
Power-to-weight	109hp/t81kW/t49hp/1000 lb Calculated	106hp/t79kW/t48hp/1000 lb Calculated
Torque-to-weight	178Nm/t119lb-ft/ton Calculated	171Nm/t115lb-ft/ton Calculated
Estimated range	967km601mi Calculated	741km460mi Calculated
Displacement	1,998cc122cu in	1,499cc91cu in
Length	4,768mm188in	3,863mm152in
Width	1,852mm73in	1,727mm68in
Height	1,384mm54in	1,415mm56in
Wheelbase	2,851mm112in	2,495mm98in
Front track	1,575mm62in	1,501mm59in
Rear track	1,611mm63in	1,501mm59in
Ground clearance	124mm5in	115mm5in
Trunk volume	300L	160L
Max trunk volume	385L	215L
Doors	2	2
Seats	4	4
Fuel tank	59L	40L

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 4 Series Convertible (G23) 420iMini Convertible (F57) Facelift 2021 Cooper 1.5PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW4 Series Convertible (G23)420i	5,000-6,500 rpm	1,350-4,000 rpm	6,750 rpm
MiniConvertible (F57)Facelift 2021Cooper 1.5	4,500-6,500 rpm	1,500-4,100 rpm	6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Convertible (G23)420i	MiniConvertible (F57)Facelift 2021Cooper 1.5
	Acceleration checkpoints
0-60 mph 0-97 km/h	7.8 s	8.2 s
0-100 km/h 0-62 mph	8.2 s	8.7 s
0-200 km/h 0-124 mph	36.3 s	72.0 s
Top speed	236 km/h 147 mph	205 km/h 127 mph
	Drag race simulation
60 ft 18 m	2.6 s	2.5 s
330 ft 101 m	6.9 s	6.9 s
1/8 mile 201 m	10.4 s	10.5 s
1000 ft 305 m	13.4 s	13.7 s
1/4 mile 402 m	15.9 s	16.3 s
Trap speed 1/4 mile 402 m	145 km/h 90 mph	138 km/h 86 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420i	184 hp 137 kW
MiniConvertible (F57)Facelift 2021Cooper 1.5	136 hp 101 kW

BMW 4 Series Convertible (G23) 420i has 48 hp more than Mini Convertible (F57) Facelift 2021 Cooper 1.5.

The biggest power difference is between Mini Convertible (F57) Facelift 2021 Cooper 1.5 and BMW 4 Series Convertible (G23) 420i: 48 hp (36 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420i	300 Nm 221 lb-ft
MiniConvertible (F57)Facelift 2021Cooper 1.5	220 Nm 162 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420i	1,690 kg 3,726 lb
MiniConvertible (F57)Facelift 2021Cooper 1.5	1,285 kg 2,833 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
BMW4 Series Convertible (G23)420i	236 km/h 147 mph
MiniConvertible (F57)Facelift 2021Cooper 1.5	205 km/h 127 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420i	8.2 s
MiniConvertible (F57)Facelift 2021Cooper 1.5	8.7 s

The biggest 0-100 km/h difference is between BMW 4 Series Convertible (G23) 420i and Mini Convertible (F57) Facelift 2021 Cooper 1.5: 0.5 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
BMW4 Series Convertible (G23)420i	6.1 L/100 km 38.6 mpg US 46.3 mpg UK
MiniConvertible (F57)Facelift 2021Cooper 1.5	5.4 L/100 km 43.6 mpg US 52.3 mpg UK

The biggest fuel consumption difference is between Mini Convertible (F57) Facelift 2021 Cooper 1.5 and BMW 4 Series Convertible (G23) 420i: 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
BMW4 Series Convertible (G23)420i	109 hp/t 81 kW/t 9.2 kg/hp
MiniConvertible (F57)Facelift 2021Cooper 1.5	106 hp/t 79 kW/t 9.4 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (G23)420i	967 km 601 mi
MiniConvertible (F57)Facelift 2021Cooper 1.5	741 km 460 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW4 Series Convertible (G23)420i	184 hp 137 kW	8.2 s	236 km/h 147 mph
MiniConvertible (F57)Facelift 2021Cooper 1.5	136 hp 101 kW	8.7 s	205 km/h 127 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

BMW4 Series Convertible (G23)420i

Power	184 hp 137 kW
0-100 km/h	8.2 s
Top speed 236 km/h 147 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

MiniConvertible (F57)Facelift 2021Cooper 1.5

Power	136 hp 101 kW
0-100 km/h	8.7 s
Top speed 205 km/h 127 mph

Doors/seats	2 doors 4 seats
Trunk	160 L 5.7 cu ft
Length	3,863 mm 152.1 in
Height	1,415 mm 55.7 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

BMW4 Series Convertible (G23)420i

Power	184 hp 137 kW
0-100 km/h	8.2 s
Top speed 236 km/h 147 mph

6.1 L/100 km

38.6 mpg US

46.3 mpg UK

MiniConvertible (F57)Facelift 2021Cooper 1.5

Power	136 hp 101 kW
0-100 km/h	8.7 s
Top speed 205 km/h 127 mph

5.4 L/100 km

43.6 mpg US

52.3 mpg UK

BMW 4 Series Convertible (G23) 420i 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
BMW4 Series Convertible (G23)420i	6.1 L/100 km 38.6 mpg US 46.3 mpg UK	8.2 s
MiniConvertible (F57)Facelift 2021Cooper 1.5	5.4 L/100 km 43.6 mpg US 52.3 mpg UK	8.7 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
BMW4 Series Convertible (G23)420i	109 hp/t 81 kW/t 9.2 kg/hp	6.1 L/100 km 38.6 mpg US 46.3 mpg UK
MiniConvertible (F57)Facelift 2021Cooper 1.5	106 hp/t 79 kW/t 9.4 kg/hp	5.4 L/100 km 43.6 mpg US 52.3 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (G23)420i

MiniConvertible (F57)Facelift 2021Cooper 1.5

Power

184 hp

137 kW

136 hp

101 kW

Torque

300 Nm

221 lb-ft

220 Nm

162 lb-ft

Acceleration

8.2 s

8.7 s

Top speed

236 km/h

147 mph

205 km/h

127 mph

Lightness

1,690 kg

3,726 lb

1,285 kg

2,833 lb

Fuel consumption

6.1 L/100 km

38.6 mpg US

46.3 mpg UK

5.4 L/100 km

43.6 mpg US

52.3 mpg UK

Practicality

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

Doors/seats	2 doors 4 seats
Trunk	160 L 5.7 cu ft
Length	3,863 mm 152.1 in
Height	1,415 mm 55.7 in

Range score

967 km

601 mi

741 km

460 mi

Trunk score

300 L

10.6 cu ft

160 L

5.7 cu ft

Power-to-weight score

109 hp/t

81 kW/t

9.2 kg/hp

106 hp/t

79 kW/t

9.4 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 4 Series Convertible (G23) 420i	Mini Convertible (F57) Facelift 2021 Cooper 1.5
Consumption	6.1 L/100 km38.6 mpg US46.3 mpg UK	5.4 L/100 km43.6 mpg US52.3 mpg UK
Cost / 100 km	10.67 LC100 km	9.45 LC100 km
Cost / 100 mi	17.18 LC100 mi	15.21 LC100 mi
Annual fuel used	915 L242 US gal201 UK gal	810 L214 US gal178 UK gal
Annual fuel cost	1,601 LC/year	1,418 LC/year