Car comparison

BMW Z4 (G29) M40ivsAUDI TTS Roadster (8S) 2.0 TFSI

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

New comparison

BMW Z4 (G29)

M40i

340 hp2998 ccGasolineAWDAutomaticTurbochargedRoadster2018-2022
VS

AUDI TTS Roadster (8S)

2.0 TFSI

310 hp1984 ccGasolineAWDAutomaticTurbochargedRoadster2014-2018

Comparison overview

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

Best choices

BMW Z4 (G29) M40i

  • Quickest 0-100 km/h
    4.5 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    340 hp
    254 kW
  • Highest torque
    500 Nm
    369 lb-ft
  • Best power-to-weight
    221 hp/t
    165 kW/t
    4.5 kg/hp
  • Largest trunk
    281 L
  • Best overall score
    60/100
  • Best performance score
    73/100
  • Best practicality score
    32/100

AUDI TTS Roadster (8S) 2.0 TFSI

  • Lightest
    1,470 kg
    3,241 lb
  • Lowest combined fuel consumption
    7.1 L/100 km
    33.1 mpg US
    39.8 mpg UK
  • Lowest city consumption
    8.6 L/100 km
    27.4 mpg US
    32.8 mpg UK
  • Lowest highway consumption
    6.2 L/100 km
    37.9 mpg US
    45.6 mpg UK
  • Lowest CO2 emissions
    163 g/km
  • Best estimated range
    775 km
    481 mi
  • Best economy score
    88/100

Specification comparison

Specification comparison
ModelBMWZ4 (G29)M40iAUDITTS Roadster (8S)2.0 TFSI
Power
340hp254kW
310hp231kW
Torque
500Nm369lb-ft
380Nm280lb-ft
Curb weight
1,535kg3,384lb
1,470kg3,241lb
Gross weight
1,860kg4,101lb
1,790kg3,946lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
57.6s99% target: 262 km/h / 163 mph
Calculated
61.7s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.5s
4.9s
0-200 km/h
15.2s
Calculated
17.0s
Calculated
0-60 mph
4.3s
Calculated
4.7s
Calculated
Fuel consumption
7.4L/100 km31.8mpg US38.2mpg UK
7.1L/100 km33.1mpg US39.8mpg UK
Fuel consumption city
9.2L/100 km25.6mpg US30.7mpg UK
8.6L/100 km27.4mpg US32.8mpg UK
Fuel consumption highway
6.3L/100 km37.3mpg US44.8mpg UK
6.2L/100 km37.9mpg US45.6mpg UK
Quarter mile
12.6s
Calculated
13.0s
Calculated
Power-to-weight
221hp/t165kW/t100hp/1000 lb
Calculated
211hp/t157kW/t96hp/1000 lb
Calculated
Torque-to-weight
326Nm/t218lb-ft/ton
Calculated
259Nm/t173lb-ft/ton
Calculated
Estimated range
703km437mi
Calculated
775km481mi
Calculated
Displacement
2,998cc183cu in
1,984cc121cu in
Length
4,324mm170in
4,191mm165in
Width
1,864mm73in
1,832mm72in
Height
1,304mm51in
1,345mm53in
Wheelbase
2,470mm97in
2,505mm99in
Front track
1,594mm63in
1,574mm62in
Rear track
1,589mm63in
1,553mm61in
Ground clearance
114mm4in
-
Trunk volume
281L
280L
Doors
2
2
Seats
2
2
Fuel tank
52L
55L
CO2 emissions
168g/km
163g/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 (G29) M40iAUDI TTS Roadster (8S) 2.0 TFSIPowerTorque
  • BMW Z4 (G29) M40i: Power / Torque
  • AUDI TTS Roadster (8S) 2.0 TFSI: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMWZ4 (G29)M40i5,000-6,500 rpm1,600-4,500 rpm6,750 rpm
AUDITTS Roadster (8S)2.0 TFSI5,800-6,200 rpm1,800-5,700 rpm6,450 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMWZ4 (G29)M40iAUDITTS Roadster (8S)2.0 TFSI
Acceleration checkpoints
0-60 mph
0-97 km/h
4.3 s
4.7 s
0-100 km/h
0-62 mph
4.5 s
4.9 s
0-200 km/h
0-124 mph
15.2 s
17.0 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.1 s
2.2 s
330 ft
101 m
5.5 s
5.7 s
1/8 mile
201 m
8.2 s
8.5 s
1000 ft
305 m
10.6 s
11.0 s
1/4 mile
402 m
12.6 s
13.0 s
Trap speed
1/4 mile
402 m
184 km/h
114 mph
178 km/h
111 mph

Power comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)M40i
340 hp
254 kW
AUDITTS Roadster (8S)2.0 TFSI
310 hp
231 kW

BMW Z4 (G29) M40i has 30 hp more than AUDI TTS Roadster (8S) 2.0 TFSI.

The biggest power difference is between AUDI TTS Roadster (8S) 2.0 TFSI and BMW Z4 (G29) M40i: 30 hp (22 kW).

Torque comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)M40i
500 Nm
369 lb-ft
AUDITTS Roadster (8S)2.0 TFSI
380 Nm
280 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)M40i
1,535 kg
3,384 lb
AUDITTS Roadster (8S)2.0 TFSI
1,470 kg
3,241 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 (G29)M40i
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
AUDITTS Roadster (8S)2.0 TFSI
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)M40i4.5 s
AUDITTS Roadster (8S)2.0 TFSI4.9 s

The biggest 0-100 km/h difference is between BMW Z4 (G29) M40i and AUDI TTS Roadster (8S) 2.0 TFSI: 0.4 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)M40i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
AUDITTS Roadster (8S)2.0 TFSI
7.1 L/100 km
33.1 mpg US
39.8 mpg UK

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
BMWZ4 (G29)M40i
221 hp/t
165 kW/t
4.5 kg/hp
AUDITTS Roadster (8S)2.0 TFSI
211 hp/t
157 kW/t
4.7 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMWZ4 (G29)M40i
703 km
437 mi
AUDITTS Roadster (8S)2.0 TFSI
775 km
481 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMWZ4 (G29)M40i
340 hp
254 kW
4.5 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
AUDITTS Roadster (8S)2.0 TFSI
310 hp
231 kW
4.9 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 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 (G29)M40i
Power
340 hp
254 kW
0-100 km/h4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 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
AUDITTS Roadster (8S)2.0 TFSI
Power
310 hp
231 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
280 L
9.9 cu ft
Length
4,191 mm
165.0 in
Height
1,345 mm
53.0 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 (G29)M40i
Power
340 hp
254 kW
0-100 km/h4.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
AUDITTS Roadster (8S)2.0 TFSI
Power
310 hp
231 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.1 L/100 km
33.1 mpg US
39.8 mpg UK

BMW Z4 (G29) M40i 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 (G29)M40i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
4.5 s
AUDITTS Roadster (8S)2.0 TFSI
7.1 L/100 km
33.1 mpg US
39.8 mpg UK
4.9 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 (G29)M40i
221 hp/t
165 kW/t
4.5 kg/hp
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
AUDITTS Roadster (8S)2.0 TFSI
211 hp/t
157 kW/t
4.7 kg/hp
7.1 L/100 km
33.1 mpg US
39.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMWZ4 (G29)M40iAUDITTS Roadster (8S)2.0 TFSI
Power
340 hp
254 kW
310 hp
231 kW
Torque
500 Nm
369 lb-ft
380 Nm
280 lb-ft
Acceleration
4.5 s
4.9 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,535 kg
3,384 lb
1,470 kg
3,241 lb
Fuel consumption
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
7.1 L/100 km
33.1 mpg US
39.8 mpg UK
Practicality
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
Doors/seats
2 doors
2 seats
Trunk
280 L
9.9 cu ft
Length
4,191 mm
165.0 in
Height
1,345 mm
53.0 in
Range score
703 km
437 mi
775 km
481 mi
CO2 score
168 g/km
163 g/km
Trunk score
281 L
9.9 cu ft
280 L
9.9 cu ft
Power-to-weight score
221 hp/t
165 kW/t
4.5 kg/hp
211 hp/t
157 kW/t
4.7 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 (G29) M40iAUDI TTS Roadster (8S) 2.0 TFSI
Consumption7.4 L/100 km31.8 mpg US38.2 mpg UK7.1 L/100 km33.1 mpg US39.8 mpg UK
Cost / 100 km12.95 LC100 km12.42 LC100 km
Cost / 100 mi20.84 LC100 mi20.00 LC100 mi
Annual fuel used1,110 L293 US gal244 UK gal1,065 L281 US gal234 UK gal
Annual fuel cost1,943 LC/year1,864 LC/year

Head-to-head comparisons

BMW Z4 (G29) M40i

  • Has 30 hp more
  • Has 120 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Has 5 km/h (3 mph) higher top speed
  • Has 11 hp/t better power-to-weight
  • Has 1 L more trunk volume

Pros

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

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Highest CO2 emissions

AUDI TTS Roadster (8S) 2.0 TFSI

  • Is 65 kg lighter
  • Uses 0.3 L/100 km less fuel
  • Has 72 km (45 mi) more estimated range
  • Emits 5 g/km less CO2

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW Z4 (G29) M40i
AUDI TTS Roadster (8S) 2.0 TFSI
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