Car comparison

BMW 1 Series Coupe (E82) 135ivsBMW 1 Series Convertible (E88) 125i

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

New comparison

BMW 1 Series Coupe (E82)

135i

306 hp2979 ccGasolineRWDAutomaticTwin-turboCoupe2007-2010
VS

BMW 1 Series Convertible (E88)

125i

218 hp2996 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2008-2011

Comparison overview

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

Best choices

BMW 1 Series Coupe (E82) 135i

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    306 hp
    228 kW
  • Highest torque
    400 Nm
    295 lb-ft
  • Lightest
    1,490 kg
    3,285 lb
  • Best power-to-weight
    205 hp/t
    153 kW/t
    4.9 kg/hp
  • Largest trunk
    370 L
  • Best overall score
    61/100
  • Best performance score
    66/100
  • Best practicality score
    50/100

BMW 1 Series Convertible (E88) 125i

  • Lowest combined fuel consumption
    8.1 L/100 km
    29.0 mpg US
    34.9 mpg UK
  • Lowest city consumption
    11.7 L/100 km
    20.1 mpg US
    24.1 mpg UK
  • Lowest highway consumption
    6.0 L/100 km
    39.2 mpg US
    47.1 mpg UK
  • Best estimated range
    654 km
    407 mi
  • Best economy score
    85/100

Specification comparison

Specification comparison
ModelBMW1 Series Coupe (E82)135iBMW1 Series Convertible (E88)125i
Power
306hp228kW
218hp163kW
Torque
400Nm295lb-ft
270Nm199lb-ft
Curb weight
1,490kg3,285lb
1,510kg3,329lb
Gross weight
1,930kg4,255lb
1,950kg4,299lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
238 km/h
148 mph
To 99% top speed
72.6s99% target: 257 km/h / 160 mph
Calculated
88.3s99% target: 236 km/h / 146 mph
Calculated
0-100 km/h
5.4s
6.8s
0-200 km/h
19.4s
Calculated
29.2s
Calculated
0-60 mph
5.1s
Calculated
6.4s
Calculated
Fuel consumption
9.2L/100 km25.6mpg US30.7mpg UK
8.1L/100 km29mpg US34.9mpg UK
Fuel consumption city
13.2L/100 km17.8mpg US21.4mpg UK
11.7L/100 km20.1mpg US24.1mpg UK
Fuel consumption highway
6.9L/100 km34.1mpg US40.9mpg UK
6L/100 km39.2mpg US47.1mpg UK
Quarter mile
13.5s
Calculated
14.8s
Calculated
Power-to-weight
205hp/t153kW/t93hp/1000 lb
Calculated
144hp/t108kW/t65hp/1000 lb
Calculated
Torque-to-weight
268Nm/t180lb-ft/ton
Calculated
179Nm/t120lb-ft/ton
Calculated
Estimated range
576km358mi
Calculated
654km407mi
Calculated
Displacement
2,979cc182cu in
2,996cc183cu in
Length
4,360mm172in
4,360mm172in
Width
1,748mm69in
1,748mm69in
Height
1,408mm55in
1,411mm56in
Wheelbase
2,660mm105in
2,660mm105in
Front track
1,470mm58in
1,474mm58in
Rear track
1,497mm59in
1,507mm59in
Ground clearance
132mm5in
140mm6in
Trunk volume
370L
260L
Max trunk volume-
305L
Doors
2
2
Seats
4
4
Fuel tank
53L
53L
CO2 emissions-
195g/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 1 Series Coupe (E82) 135iBMW 1 Series Convertible (E88) 125iPowerTorque
  • BMW 1 Series Coupe (E82) 135i: Power / Torque
  • BMW 1 Series Convertible (E88) 125i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW1 Series Coupe (E82)135i5,800 rpm1,300-5,000 rpm6,050 rpm
BMW1 Series Convertible (E88)125i6,100 rpm2,500-4,250 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW1 Series Coupe (E82)135iBMW1 Series Convertible (E88)125i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
6.4 s
0-100 km/h
0-62 mph
5.4 s
6.8 s
0-200 km/h
0-124 mph
19.4 s
29.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
238 km/h
148 mph
Drag race simulation
60 ft
18 m
2.2 s
2.4 s
330 ft
101 m
5.9 s
6.4 s
1/8 mile
201 m
8.9 s
9.7 s
1000 ft
305 m
11.4 s
12.5 s
1/4 mile
402 m
13.5 s
14.8 s
Trap speed
1/4 mile
402 m
171 km/h
106 mph
154 km/h
96 mph

Power comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i
306 hp
228 kW
BMW1 Series Convertible (E88)125i
218 hp
163 kW

BMW 1 Series Coupe (E82) 135i has 88 hp more than BMW 1 Series Convertible (E88) 125i.

The biggest power difference is between BMW 1 Series Convertible (E88) 125i and BMW 1 Series Coupe (E82) 135i: 88 hp (66 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i
400 Nm
295 lb-ft
BMW1 Series Convertible (E88)125i
270 Nm
199 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i
1,490 kg
3,285 lb
BMW1 Series Convertible (E88)125i
1,510 kg
3,329 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW1 Series Convertible (E88)125i
238 km/h
148 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i5.4 s
BMW1 Series Convertible (E88)125i6.8 s

The biggest 0-100 km/h difference is between BMW 1 Series Coupe (E82) 135i and BMW 1 Series Convertible (E88) 125i: 1.4 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

The biggest fuel consumption difference is between BMW 1 Series Convertible (E88) 125i and BMW 1 Series Coupe (E82) 135i: 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
VehicleValue
BMW1 Series Coupe (E82)135i
205 hp/t
153 kW/t
4.9 kg/hp
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW1 Series Coupe (E82)135i
576 km
358 mi
BMW1 Series Convertible (E88)125i
654 km
407 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW1 Series Coupe (E82)135i
306 hp
228 kW
5.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW1 Series Convertible (E88)125i
218 hp
163 kW
6.8 s
238 km/h
148 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
BMW1 Series Coupe (E82)135i
Power
306 hp
228 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
370 L
13.1 cu ft
Length
4,360 mm
171.7 in
Height
1,408 mm
55.4 in
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
Doors/seats
2 doors
4 seats
Trunk
260 L
9.2 cu ft
Length
4,360 mm
171.7 in
Height
1,411 mm
55.6 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
BMW1 Series Coupe (E82)135i
Power
306 hp
228 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

BMW 1 Series Coupe (E82) 135i 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
BMW1 Series Coupe (E82)135i
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
5.4 s
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
6.8 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
BMW1 Series Coupe (E82)135i
205 hp/t
153 kW/t
4.9 kg/hp
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW1 Series Coupe (E82)135iBMW1 Series Convertible (E88)125i
Power
306 hp
228 kW
218 hp
163 kW
Torque
400 Nm
295 lb-ft
270 Nm
199 lb-ft
Acceleration
5.4 s
6.8 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
238 km/h
148 mph
Lightness
1,490 kg
3,285 lb
1,510 kg
3,329 lb
Fuel consumption
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
370 L
13.1 cu ft
Length
4,360 mm
171.7 in
Height
1,408 mm
55.4 in
Doors/seats
2 doors
4 seats
Trunk
260 L
9.2 cu ft
Length
4,360 mm
171.7 in
Height
1,411 mm
55.6 in
Range score
576 km
358 mi
654 km
407 mi
CO2 score
-
195 g/km
Trunk score
370 L
13.1 cu ft
260 L
9.2 cu ft
Power-to-weight score
205 hp/t
153 kW/t
4.9 kg/hp
144 hp/t
108 kW/t
6.9 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 1 Series Coupe (E82) 135iBMW 1 Series Convertible (E88) 125i
Consumption9.2 L/100 km25.6 mpg US30.7 mpg UK8.1 L/100 km29 mpg US34.9 mpg UK
Cost / 100 km16.10 LC100 km14.17 LC100 km
Cost / 100 mi25.91 LC100 mi22.81 LC100 mi
Annual fuel used1,380 L365 US gal304 UK gal1,215 L321 US gal267 UK gal
Annual fuel cost2,415 LC/year2,126 LC/year

Head-to-head comparisons

BMW 1 Series Coupe (E82) 135i

  • Has 88 hp more
  • Has 130 Nm more
  • Is 20 kg lighter
  • Is 1.4 s quicker from 0-100 km/h
  • Has 22 km/h (14 mph) higher top speed
  • Has 61 hp/t better power-to-weight
  • Has 110 L more trunk volume

Pros

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

Cons

  • Highest combined fuel consumption

BMW 1 Series Convertible (E88) 125i

  • Uses 1.1 L/100 km less fuel
  • Has 78 km (49 mi) more estimated range

Pros

  • Lowest combined fuel consumption
  • Best estimated range

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 1 Series Coupe (E82) 135i
BMW 1 Series Convertible (E88) 125i
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BMW 1 Series Coupe (E82) 135i vs BMW 1 Series Convertible (E88) 125i - car comparison - FastVsFaster