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 ccGasolineRWDManualTurbochargedCabriolet / convertible2017-2020

BMW X3 (G01)

20i

184 hp1998 ccGasolineRWDAutomaticTurbocharged2018-2021

Comparison overview

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

BMW 4 Series Convertible (F33) Facelift 2017 420i

Quickest 0-100 km/h
8.2 s
Fastest top speed
230 km/h
143 mph
Most powerful
184 hp
137 kW
Highest torque
290 Nm
214 lb-ft
Lowest combined fuel consumption
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
Lowest CO2 emissions
153 g/km
Best performance score
47/100
Best economy score
89/100

BMW X3 (G01) 20i

Lightest
1,685 kg
3,715 lb
Best power-to-weight
109 hp/t
81 kW/t
9.2 kg/hp
Best estimated range
919 km
571 mi
Largest trunk
550 L
Best overall score
56/100
Best practicality score
77/100

Specification comparison

Specification comparison
Model	BMW4 Series Convertible (F33)Facelift 2017420i	BMWX3 (G01)20i
Power	184hp137kW	184hp137kW
Torque	290Nm214lb-ft	290Nm214lb-ft
Curb weight	1,700kg3,748lb	1,685kg3,715lb
Gross weight	2,170kg4,784lb	2,400kg5,291lb
Top speed	230 km/h 143 mph	215 km/h 134 mph
To 99% top speed	105.7s99% target: 228 km/h / 141 mph Calculated	102.4s99% target: 213 km/h / 132 mph Calculated
0-100 km/h	8.2s	8.2s
0-200 km/h	39.0s Calculated	51.2s Calculated
0-60 mph	7.7s Calculated	7.7s Calculated
Fuel consumption	6.6L/100 km35.6mpg US42.8mpg UK	7.4L/100 km31.8mpg US38.2mpg UK
Fuel consumption city	8.6L/100 km27.4mpg US32.8mpg UK	-
Fuel consumption highway	5.5L/100 km42.8mpg US51.4mpg UK	-
Quarter mile	15.9s Calculated	15.9s Calculated
Power-to-weight	108hp/t81kW/t49hp/1000 lb Calculated	109hp/t81kW/t50hp/1000 lb Calculated
Torque-to-weight	171Nm/t114lb-ft/ton Calculated	172Nm/t115lb-ft/ton Calculated
Estimated range	909km565mi Calculated	919km571mi 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	1,620mm64in
Rear track	1,593mm63in	1,636mm64in
Ground clearance	130mm5in	204mm8in
Trunk volume	370L	550L
Max trunk volume	-	1,600L
Doors	2	5
Seats	4	5
Fuel tank	60L	68L
CO2 emissions	153g/km	169g/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 rpm	1,350-4,600 rpm	5,250 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	7.7 s	7.7 s
0-100 km/h 0-62 mph	8.2 s	8.2 s
0-200 km/h 0-124 mph	39.0 s	51.2 s
Top speed	230 km/h 143 mph	215 km/h 134 mph
	Drag race simulation
60 ft 18 m	2.5 s	2.5 s
330 ft 101 m	6.8 s	6.7 s
1/8 mile 201 m	10.4 s	10.3 s
1000 ft 305 m	13.4 s	13.4 s
1/4 mile 402 m	15.9 s	15.9 s
Trap speed 1/4 mile 402 m	144 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	290 Nm 214 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	1,700 kg 3,748 lb
BMWX3 (G01)20i	1,685 kg 3,715 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	8.2 s
BMWX3 (G01)20i	8.2 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	6.6 L/100 km 35.6 mpg US 42.8 mpg UK
BMWX3 (G01)20i	7.4 L/100 km 31.8 mpg US 38.2 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) Facelift 2017 420i and BMW X3 (G01) 20i: 0.8 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	108 hp/t 81 kW/t 9.2 kg/hp
BMWX3 (G01)20i	109 hp/t 81 kW/t 9.2 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	909 km 565 mi
BMWX3 (G01)20i	919 km 571 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	8.2 s	230 km/h 143 mph
BMWX3 (G01)20i	184 hp 137 kW	8.2 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	8.2 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	8.2 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	8.2 s
Top speed 230 km/h 143 mph

6.6 L/100 km

35.6 mpg US

42.8 mpg UK

BMWX3 (G01)20i

Power	184 hp 137 kW
0-100 km/h	8.2 s
Top speed 215 km/h 134 mph

7.4 L/100 km

31.8 mpg US

38.2 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	6.6 L/100 km 35.6 mpg US 42.8 mpg UK	8.2 s
BMWX3 (G01)20i	7.4 L/100 km 31.8 mpg US 38.2 mpg UK	8.2 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	108 hp/t 81 kW/t 9.2 kg/hp	6.6 L/100 km 35.6 mpg US 42.8 mpg UK
BMWX3 (G01)20i	109 hp/t 81 kW/t 9.2 kg/hp	7.4 L/100 km 31.8 mpg US 38.2 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

290 Nm

214 lb-ft

290 Nm

214 lb-ft

Acceleration

8.2 s

Top speed

230 km/h

143 mph

215 km/h

134 mph

Lightness

1,700 kg

3,748 lb

1,685 kg

3,715 lb

Fuel consumption

6.6 L/100 km

35.6 mpg US

42.8 mpg UK

7.4 L/100 km

31.8 mpg US

38.2 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

909 km

565 mi

919 km

571 mi

CO2 score

153 g/km

169 g/km

Trunk score

370 L

13.1 cu ft

550 L

19.4 cu ft

Power-to-weight score

108 hp/t

81 kW/t

9.2 kg/hp

109 hp/t

81 kW/t

9.2 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	6.6 L/100 km35.6 mpg US42.8 mpg UK	7.4 L/100 km31.8 mpg US38.2 mpg UK
Cost / 100 km	11.55 LC100 km	12.95 LC100 km
Cost / 100 mi	18.59 LC100 mi	20.84 LC100 mi
Annual fuel used	990 L262 US gal218 UK gal	1,110 L293 US gal244 UK gal
Annual fuel cost	1,733 LC/year	1,943 LC/year