Car comparison

BMW Z4 (E89) 28ivsBMW Z4 (G29) 20i

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

New comparison

BMW Z4 (E89)

28i

245 hp1997 ccGasolineRWDAutomaticTurbochargedRoadster2011-2013
VS

BMW Z4 (G29)

20i

197 hp1998 ccGasolineRWDAutomaticTurbochargedRoadster2018-2022

Comparison overview

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

Best choices

BMW Z4 (E89) 28i

  • Quickest 0-100 km/h
    5.5 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    245 hp
    183 kW
  • Highest torque
    350 Nm
    258 lb-ft
  • Best power-to-weight
    164 hp/t
    122 kW/t
    6.1 kg/hp
  • Best overall score
    52/100
  • Best performance score
    62/100
  • Best practicality score
    32/100

BMW Z4 (G29) 20i

  • Lightest
    1,430 kg
    3,153 lb
  • Lowest combined fuel consumption
    6.0 L/100 km
    39.2 mpg US
    47.1 mpg UK
  • Lowest city consumption
    7.2 L/100 km
    32.7 mpg US
    39.2 mpg UK
  • Lowest highway consumption
    5.2 L/100 km
    45.2 mpg US
    54.3 mpg UK
  • Best estimated range
    867 km
    539 mi
  • Best economy score
    91/100

Specification comparison

Specification comparison
ModelBMWZ4 (E89)28iBMWZ4 (G29)20i
Power
245hp183kW
197hp147kW
Torque
350Nm258lb-ft
320Nm236lb-ft
Curb weight
1,495kg3,296lb
1,430kg3,153lb
Gross weight
1,750kg3,858lb
1,740kg3,836lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
240 km/h
149 mph
To 99% top speed
73.0s99% target: 257 km/h / 160 mph
Calculated
77.9s99% target: 238 km/h / 148 mph
Calculated
0-100 km/h
5.5s
6.6s
0-200 km/h
19.6s
Calculated
26.3s
Calculated
0-60 mph
5.2s
Calculated
6.3s
Calculated
Fuel consumption
6.8L/100 km34.6mpg US41.5mpg UK
6L/100 km39.2mpg US47.1mpg UK
Fuel consumption city
9.4L/100 km25mpg US30.1mpg UK
7.2L/100 km32.7mpg US39.2mpg UK
Fuel consumption highway
5.3L/100 km44.4mpg US53.3mpg UK
5.2L/100 km45.2mpg US54.3mpg UK
Quarter mile
13.6s
Calculated
14.6s
Calculated
Power-to-weight
164hp/t122kW/t74hp/1000 lb
Calculated
138hp/t103kW/t62hp/1000 lb
Calculated
Torque-to-weight
234Nm/t157lb-ft/ton
Calculated
224Nm/t150lb-ft/ton
Calculated
Estimated range
809km503mi
Calculated
867km539mi
Calculated
Displacement
1,997cc122cu in
1,998cc122cu in
Length
4,239mm167in
4,324mm170in
Width
1,790mm70in
1,864mm73in
Height
1,291mm51in
1,304mm51in
Wheelbase
2,496mm98in
2,470mm97in
Front track
1,511mm59in
1,609mm63in
Rear track
1,559mm61in
1,616mm64in
Ground clearance-
117mm5in
Trunk volume-
281L
Doors
2
2
Seats
2
2
Fuel tank
55L
52L
CO2 emissions
159g/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 Z4 (E89) 28iBMW Z4 (G29) 20iPowerTorque
  • BMW Z4 (E89) 28i: Power / Torque
  • BMW Z4 (G29) 20i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMWZ4 (E89)28i5,000-6,500 rpm1,250-4,800 rpm6,750 rpm
BMWZ4 (G29)20i4,500-6,500 rpm1,450-4,200 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMWZ4 (E89)28iBMWZ4 (G29)20i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.2 s
6.3 s
0-100 km/h
0-62 mph
5.5 s
6.6 s
0-200 km/h
0-124 mph
19.6 s
26.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
240 km/h
149 mph
Drag race simulation
60 ft
18 m
2.3 s
2.4 s
330 ft
101 m
5.9 s
6.4 s
1/8 mile
201 m
8.9 s
9.6 s
1000 ft
305 m
11.5 s
12.3 s
1/4 mile
402 m
13.6 s
14.6 s
Trap speed
1/4 mile
402 m
171 km/h
106 mph
158 km/h
98 mph

Power comparison

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

Chart data table
VehicleValue
BMWZ4 (E89)28i
245 hp
183 kW
BMWZ4 (G29)20i
197 hp
147 kW

BMW Z4 (E89) 28i has 48 hp more than BMW Z4 (G29) 20i.

The biggest power difference is between BMW Z4 (G29) 20i and BMW Z4 (E89) 28i: 48 hp (36 kW).

Torque comparison

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

Chart data table
VehicleValue
BMWZ4 (E89)28i
350 Nm
258 lb-ft
BMWZ4 (G29)20i
320 Nm
236 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMWZ4 (E89)28i
1,495 kg
3,296 lb
BMWZ4 (G29)20i
1,430 kg
3,153 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMWZ4 (E89)28i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWZ4 (G29)20i
240 km/h
149 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMWZ4 (E89)28i5.5 s
BMWZ4 (G29)20i6.6 s

The biggest 0-100 km/h difference is between BMW Z4 (E89) 28i and BMW Z4 (G29) 20i: 1.1 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMWZ4 (E89)28i
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
BMWZ4 (G29)20i
6.0 L/100 km
39.2 mpg US
47.1 mpg UK

The biggest fuel consumption difference is between BMW Z4 (G29) 20i and BMW Z4 (E89) 28i: 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
VehicleValue
BMWZ4 (E89)28i
164 hp/t
122 kW/t
6.1 kg/hp
BMWZ4 (G29)20i
138 hp/t
103 kW/t
7.3 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMWZ4 (E89)28i
809 km
503 mi
BMWZ4 (G29)20i
867 km
539 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMWZ4 (E89)28i
245 hp
183 kW
5.5 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWZ4 (G29)20i
197 hp
147 kW
6.6 s
240 km/h
149 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
BMWZ4 (E89)28i
Power
245 hp
183 kW
0-100 km/h5.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk-
Length
4,239 mm
166.9 in
Height
1,291 mm
50.8 in
BMWZ4 (G29)20i
Power
197 hp
147 kW
0-100 km/h6.6 s
Top speed
240 km/h
149 mph
Doors/seats
2 doors
2 seats
Trunk
281 L
9.9 cu ft
Length
4,324 mm
170.2 in
Height
1,304 mm
51.3 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
BMWZ4 (E89)28i
Power
245 hp
183 kW
0-100 km/h5.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
BMWZ4 (G29)20i
Power
197 hp
147 kW
0-100 km/h6.6 s
Top speed
240 km/h
149 mph
6.0 L/100 km
39.2 mpg US
47.1 mpg UK

BMW Z4 (E89) 28i 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
BMWZ4 (E89)28i
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
5.5 s
BMWZ4 (G29)20i
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
6.6 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
BMWZ4 (E89)28i
164 hp/t
122 kW/t
6.1 kg/hp
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
BMWZ4 (G29)20i
138 hp/t
103 kW/t
7.3 kg/hp
6.0 L/100 km
39.2 mpg US
47.1 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMWZ4 (E89)28iBMWZ4 (G29)20i
Power
245 hp
183 kW
197 hp
147 kW
Torque
350 Nm
258 lb-ft
320 Nm
236 lb-ft
Acceleration
5.5 s
6.6 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
240 km/h
149 mph
Lightness
1,495 kg
3,296 lb
1,430 kg
3,153 lb
Fuel consumption
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
6.0 L/100 km
39.2 mpg US
47.1 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk-
Length
4,239 mm
166.9 in
Height
1,291 mm
50.8 in
Doors/seats
2 doors
2 seats
Trunk
281 L
9.9 cu ft
Length
4,324 mm
170.2 in
Height
1,304 mm
51.3 in
Range score
809 km
503 mi
867 km
539 mi
CO2 score
159 g/km
-
Trunk score
-
281 L
9.9 cu ft
Power-to-weight score
164 hp/t
122 kW/t
6.1 kg/hp
138 hp/t
103 kW/t
7.3 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 Z4 (E89) 28iBMW Z4 (G29) 20i
Consumption6.8 L/100 km34.6 mpg US41.5 mpg UK6 L/100 km39.2 mpg US47.1 mpg UK
Cost / 100 km11.90 LC100 km10.50 LC100 km
Cost / 100 mi19.15 LC100 mi16.90 LC100 mi
Annual fuel used1,020 L269 US gal224 UK gal900 L238 US gal198 UK gal
Annual fuel cost1,785 LC/year1,575 LC/year

Head-to-head comparisons

BMW Z4 (E89) 28i

  • Has 48 hp more
  • Has 30 Nm more
  • Is 1.1 s quicker from 0-100 km/h
  • Has 20 km/h (12 mph) higher top speed
  • Has 26 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio

Cons

  • Highest combined fuel consumption
  • Heaviest

BMW Z4 (G29) 20i

  • Is 65 kg lighter
  • Uses 0.8 L/100 km less fuel
  • Has 58 km (36 mi) more estimated range

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW Z4 (E89) 28i
BMW Z4 (G29) 20i
Compare selected cars
2 vehicles selected

Popular comparisons

28i
30i
VS
BMWZ4 (E89)28ivsBMWZ4 (G29)30i
20i
20i
VS
BMWZ4 (G29)20ivsBMWZ4 (G29 LCI)Facelift 202220i
28i
3.0i
VS
BMWZ4 (E89)28ivsBMWZ4 (E85)3.0i
20i
30i
VS
BMWZ4 (G29)20ivsBMWZ4 (E89)30i
28i
3.0 si
VS
BMWZ4 (E89)28ivsBMWZ4 Coupe (E86)3.0 si
28i
2.0 TFSI
VS
BMWZ4 (E89)28ivsAUDITTS Roadster (8J)Facelift 20102.0 TFSI
20i
40 TFSI
VS
BMWZ4 (G29)20ivsAUDITT Roadster (8S)Facelift 201840 TFSI
28i
2.9
VS
BMWZ4 (E89)28ivsPorscheBoxster (987)Facelift 20092.9
20i
SLK 250d
VS
BMWZ4 (G29)20ivsMercedes-BenzSLK (R172)SLK 250d
20i
1.8 TFSI
VS
BMWZ4 (G29)20ivsAUDITT Roadster (8S)1.8 TFSI
28i
2.0 TFSI
VS
BMWZ4 (E89)28ivsAUDITT Roadster (8J)Facelift 20102.0 TFSI
20i
2.8
VS
BMWZ4 (G29)20ivsBMWZ3 (E36/7)2.8
BMW Z4 (E89) 28i vs BMW Z4 (G29) 20i - car comparison - FastVsFaster