Car comparison

BMW 4 Series Convertible (F33) · Facelift 2017 420ivsBMW X3 (G01) 20i

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

New comparison

BMW 4 Series Convertible (F33) · Facelift 2017

420i

184 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2017-2020

BMW X3 (G01)

20i

184 hp1998 ccGasolineAWDAutomaticTwin-turbo2017-2021

Comparison overview

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

BMW 4 Series Convertible (F33) Facelift 2017 420i

Fastest top speed
230 km/h
143 mph
Most powerful
184 hp
137 kW
Lightest
1,715 kg
3,781 lb
Best power-to-weight
107 hp/t
80 kW/t
9.3 kg/hp
Lowest combined fuel consumption
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
Lowest city consumption
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Lowest highway consumption
5.1 L/100 km
46.1 mpg US
55.4 mpg UK
Lowest CO2 emissions
144 g/km
Best estimated range
968 km
601 mi
Best performance score
46/100
Best economy score
90/100

BMW X3 (G01) 20i

Quickest 0-100 km/h
8.3 s
Highest torque
290 Nm
214 lb-ft
Largest trunk
550 L
Best overall score
55/100
Best practicality score
77/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (F33)Facelift 2017420i	BMWX3 (G01)20i
Power	184hp137kW	184hp137kW
Torque	270Nm199lb-ft	290Nm214lb-ft
Curb weight	1,715kg3,781lb	1,790kg3,946lb
Gross weight	2,185kg4,817lb	2,385kg5,258lb
Top speed	230 km/h 143 mph	215 km/h 134 mph
To 99% top speed	108.6s99% target: 228 km/h / 141 mph Calculated	105.9s99% target: 213 km/h / 132 mph Calculated
0-100 km/h	8.4s	8.3s
0-200 km/h	40.0s Calculated	52.7s Calculated
0-60 mph	7.9s Calculated	7.8s Calculated
Fuel consumption	6.2L/100 km37.9mpg US45.6mpg UK	7.3L/100 km32.2mpg US38.7mpg UK
Fuel consumption city	8.1L/100 km29mpg US34.9mpg UK	8.6L/100 km27.4mpg US32.8mpg UK
Fuel consumption highway	5.1L/100 km46.1mpg US55.4mpg UK	6.6L/100 km35.6mpg US42.8mpg UK
Quarter mile	16.1s Calculated	16.0s Calculated
Power-to-weight	107hp/t80kW/t49hp/1000 lb Calculated	103hp/t77kW/t47hp/1000 lb Calculated
Torque-to-weight	157Nm/t105lb-ft/ton Calculated	162Nm/t108lb-ft/ton Calculated
Estimated range	968km601mi Calculated	822km511mi Calculated
Displacement	1,998cc122cu in	1,998cc122cu in
Length	4,640mm183in	4,708mm185in
Width	1,825mm72in	1,891mm74in
Height	1,384mm54in	1,676mm66in
Wheelbase	2,810mm111in	2,864mm113in
Front track	1,544mm61in	-
Rear track	1,593mm63in	-
Ground clearance	130mm5in	-
Trunk volume	370L	550L
Max trunk volume	-	1,600L
Doors	2	5
Seats	4	5
Fuel tank	60L	60L
CO2 emissions	144g/km	168g/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 4 Series Convertible (F33) Facelift 2017 420iBMW X3 (G01) 20iPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW4 Series Convertible (F33)Facelift 2017420i	5,000 rpm	1,350-4,600 rpm	5,250 rpm
BMWX3 (G01)20i	5,000-6,500 rpm	1,350-4,250 rpm	6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW4 Series Convertible (F33)Facelift 2017420i	BMWX3 (G01)20i
	Acceleration checkpoints
0-60 mph 0-97 km/h	7.9 s	7.8 s
0-100 km/h 0-62 mph	8.4 s	8.3 s
0-200 km/h 0-124 mph	40.0 s	52.7 s
Top speed	230 km/h 143 mph	215 km/h 134 mph
	Drag race simulation
60 ft 18 m	2.6 s	2.5 s
330 ft 101 m	6.9 s	6.7 s
1/8 mile 201 m	10.5 s	10.3 s
1000 ft 305 m	13.5 s	13.4 s
1/4 mile 402 m	16.1 s	16.0 s
Trap speed 1/4 mile 402 m	143 km/h 89 mph	140 km/h 87 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017420i	184 hp 137 kW
BMWX3 (G01)20i	184 hp 137 kW

Torque comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017420i	270 Nm 199 lb-ft
BMWX3 (G01)20i	290 Nm 214 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017420i	1,715 kg 3,781 lb
BMWX3 (G01)20i	1,790 kg 3,946 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 (F33)Facelift 2017420i	230 km/h 143 mph
BMWX3 (G01)20i	215 km/h 134 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 (F33)Facelift 2017420i	8.4 s
BMWX3 (G01)20i	8.3 s

The biggest 0-100 km/h difference is between BMW X3 (G01) 20i and BMW 4 Series Convertible (F33) Facelift 2017 420i: 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
BMW4 Series Convertible (F33)Facelift 2017420i	6.2 L/100 km 37.9 mpg US 45.6 mpg UK
BMWX3 (G01)20i	7.3 L/100 km 32.2 mpg US 38.7 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) Facelift 2017 420i and BMW X3 (G01) 20i: 1.1 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 (F33)Facelift 2017420i	107 hp/t 80 kW/t 9.3 kg/hp
BMWX3 (G01)20i	103 hp/t 77 kW/t 9.7 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
BMW4 Series Convertible (F33)Facelift 2017420i	968 km 601 mi
BMWX3 (G01)20i	822 km 511 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
BMW4 Series Convertible (F33)Facelift 2017420i	184 hp 137 kW	8.4 s	230 km/h 143 mph
BMWX3 (G01)20i	184 hp 137 kW	8.3 s	215 km/h 134 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 (F33)Facelift 2017420i

Power	184 hp 137 kW
0-100 km/h	8.4 s
Top speed 230 km/h 143 mph

Doors/seats	2 doors 4 seats
Trunk	370 L 13.1 cu ft
Length	4,640 mm 182.7 in
Height	1,384 mm 54.5 in

BMWX3 (G01)20i

Power	184 hp 137 kW
0-100 km/h	8.3 s
Top speed 215 km/h 134 mph

Doors/seats	5 doors 5 seats
Trunk	550 L 19.4 cu ft
Length	4,708 mm 185.4 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.

Vehicle

Performance score

Fuel economy score

BMW4 Series Convertible (F33)Facelift 2017420i

Power	184 hp 137 kW
0-100 km/h	8.4 s
Top speed 230 km/h 143 mph

6.2 L/100 km

37.9 mpg US

45.6 mpg UK

BMWX3 (G01)20i

Power	184 hp 137 kW
0-100 km/h	8.3 s
Top speed 215 km/h 134 mph

7.3 L/100 km

32.2 mpg US

38.7 mpg UK

BMW 4 Series Convertible (F33) Facelift 2017 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 (F33)Facelift 2017420i	6.2 L/100 km 37.9 mpg US 45.6 mpg UK	8.4 s
BMWX3 (G01)20i	7.3 L/100 km 32.2 mpg US 38.7 mpg UK	8.3 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 (F33)Facelift 2017420i	107 hp/t 80 kW/t 9.3 kg/hp	6.2 L/100 km 37.9 mpg US 45.6 mpg UK
BMWX3 (G01)20i	103 hp/t 77 kW/t 9.7 kg/hp	7.3 L/100 km 32.2 mpg US 38.7 mpg UK

Detailed score breakdown

Vehicle

BMW4 Series Convertible (F33)Facelift 2017420i

BMWX3 (G01)20i

Power

184 hp

137 kW

184 hp

137 kW

Torque

270 Nm

199 lb-ft

290 Nm

214 lb-ft

Acceleration

8.4 s

8.3 s

Top speed

230 km/h

143 mph

215 km/h

134 mph

Lightness

1,715 kg

3,781 lb

1,790 kg

3,946 lb

Fuel consumption

6.2 L/100 km

37.9 mpg US

45.6 mpg UK

7.3 L/100 km

32.2 mpg US

38.7 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	370 L 13.1 cu ft
Length	4,640 mm 182.7 in
Height	1,384 mm 54.5 in

Doors/seats	5 doors 5 seats
Trunk	550 L 19.4 cu ft
Length	4,708 mm 185.4 in
Height	1,676 mm 66.0 in

Range score

968 km

601 mi

822 km

511 mi

CO2 score

144 g/km

168 g/km

Trunk score

370 L

13.1 cu ft

550 L

19.4 cu ft

Power-to-weight score

107 hp/t

80 kW/t

9.3 kg/hp

103 hp/t

77 kW/t

9.7 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 (F33) Facelift 2017 420i	BMW X3 (G01) 20i
Consumption	6.2 L/100 km37.9 mpg US45.6 mpg UK	7.3 L/100 km32.2 mpg US38.7 mpg UK
Cost / 100 km	10.85 LC100 km	12.78 LC100 km
Cost / 100 mi	17.46 LC100 mi	20.56 LC100 mi
Annual fuel used	930 L246 US gal205 UK gal	1,095 L289 US gal241 UK gal
Annual fuel cost	1,628 LC/year	1,916 LC/year