Car comparison

Porsche Boxster (981) GTS 3.4vsMercedes-Benz SLK (R172) SLK 350 V6

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

New comparison

Porsche Boxster (981)

GTS 3.4

330 hp3436 ccGasolineRWDDual-clutchNaturally aspiratedRoadster2015-2016

Mercedes-Benz SLK (R172)

SLK 350 V6

306 hp3498 ccGasolineRWDAutomaticNaturally aspiratedRoadster2011-2015

Comparison overview

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

Porsche Boxster (981) GTS 3.4

Quickest 0-100 km/h
4.9 s
Fastest top speed
279 km/h
173 mph
Most powerful
330 hp
246 kW
Highest torque
370 Nm
273 lb-ft
Lightest
1,375 kg
3,031 lb
Best power-to-weight
240 hp/t
179 kW/t
4.2 kg/hp
Largest trunk
280 L
Best overall score
58/100
Best performance score
70/100
Best practicality score
31/100

Mercedes-Benz SLK (R172) SLK 350 V6

Lowest combined fuel consumption
7.1 L/100 km
33.1 mpg US
39.8 mpg UK
Lowest city consumption
9.9 L/100 km
23.8 mpg US
28.5 mpg UK
Lowest highway consumption
5.5 L/100 km
42.8 mpg US
51.4 mpg UK
Lowest CO2 emissions
167 g/km
Best estimated range
845 km
525 mi
Best economy score
88/100

Specification comparison

Specification comparison
Model	PorscheBoxster (981)GTS 3.4	Mercedes-BenzSLK (R172)SLK 350 V6
Power	330hp246kW	306hp228kW
Torque	370Nm273lb-ft	370Nm273lb-ft
Curb weight	1,375kg3,031lb	1,465kg3,230lb
Gross weight	1,685kg3,715lb	1,855kg4,090lb
Top speed	279 km/h 173 mph	Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph Calculated
To 99% top speed	64.2s99% target: 276 km/h / 172 mph Calculated	72.3s99% target: 262 km/h / 163 mph Calculated
0-100 km/h	4.9s	5.6s
0-200 km/h	15.5s Calculated	19.0s Calculated
0-60 mph	4.7s Calculated	5.3s Calculated
Fuel consumption	8.2L/100 km28.7mpg US34.4mpg UK	7.1L/100 km33.1mpg US39.8mpg UK
Fuel consumption city	11.4L/100 km20.6mpg US24.8mpg UK	9.9L/100 km23.8mpg US28.5mpg UK
Fuel consumption highway	6.3L/100 km37.3mpg US44.8mpg UK	5.5L/100 km42.8mpg US51.4mpg UK
Quarter mile	12.9s Calculated	13.7s Calculated
Power-to-weight	240hp/t179kW/t109hp/1000 lb Calculated	209hp/t156kW/t95hp/1000 lb Calculated
Torque-to-weight	269Nm/t180lb-ft/ton Calculated	253Nm/t169lb-ft/ton Calculated
Estimated range	780km485mi Calculated	845km525mi Calculated
Displacement	3,436cc210cu in	3,498cc213cu in
Length	4,404mm173in	4,134mm163in
Width	1,801mm71in	1,810mm71in
Height	1,273mm50in	1,301mm51in
Wheelbase	2,475mm97in	2,430mm96in
Front track	-	1,559mm61in
Rear track	-	1,565mm62in
Trunk volume	280L	225L
Max trunk volume	-	335L
Doors	2	2
Seats	2	2
Fuel tank	64L	60L
CO2 emissions	190g/km	167g/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.

Porsche Boxster (981) GTS 3.4Mercedes-Benz SLK (R172) SLK 350 V6PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
PorscheBoxster (981)GTS 3.4	6,700 rpm	4,500-5,800 rpm	6,950 rpm
Mercedes-BenzSLK (R172)SLK 350 V6	6,500 rpm	3,500-5,250 rpm	6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	PorscheBoxster (981)GTS 3.4	Mercedes-BenzSLK (R172)SLK 350 V6
	Acceleration checkpoints
0-60 mph 0-97 km/h	4.7 s	5.3 s
0-100 km/h 0-62 mph	4.9 s	5.6 s
0-200 km/h 0-124 mph	15.5 s	19.0 s
Top speed	279 km/h 173 mph	Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph Limited
	Drag race simulation
60 ft 18 m	2.2 s	2.3 s
330 ft 101 m	5.7 s	6.0 s
1/8 mile 201 m	8.5 s	9.0 s
1000 ft 305 m	10.9 s	11.5 s
1/4 mile 402 m	12.9 s	13.7 s
Trap speed 1/4 mile 402 m	183 km/h 114 mph	172 km/h 107 mph

Power comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (981)GTS 3.4	330 hp 246 kW
Mercedes-BenzSLK (R172)SLK 350 V6	306 hp 228 kW

Porsche Boxster (981) GTS 3.4 has 24 hp more than Mercedes-Benz SLK (R172) SLK 350 V6.

The biggest power difference is between Mercedes-Benz SLK (R172) SLK 350 V6 and Porsche Boxster (981) GTS 3.4: 24 hp (18 kW).

Torque comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (981)GTS 3.4	370 Nm 273 lb-ft
Mercedes-BenzSLK (R172)SLK 350 V6	370 Nm 273 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (981)GTS 3.4	1,375 kg 3,031 lb
Mercedes-BenzSLK (R172)SLK 350 V6	1,465 kg 3,230 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
PorscheBoxster (981)GTS 3.4	279 km/h 173 mph
Mercedes-BenzSLK (R172)SLK 350 V6	Unrestricted 265 km/h165 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
Vehicle	Value
PorscheBoxster (981)GTS 3.4	4.9 s
Mercedes-BenzSLK (R172)SLK 350 V6	5.6 s

The biggest 0-100 km/h difference is between Porsche Boxster (981) GTS 3.4 and Mercedes-Benz SLK (R172) SLK 350 V6: 0.7 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
PorscheBoxster (981)GTS 3.4	8.2 L/100 km 28.7 mpg US 34.4 mpg UK
Mercedes-BenzSLK (R172)SLK 350 V6	7.1 L/100 km 33.1 mpg US 39.8 mpg UK

The biggest fuel consumption difference is between Mercedes-Benz SLK (R172) SLK 350 V6 and Porsche Boxster (981) GTS 3.4: 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
PorscheBoxster (981)GTS 3.4	240 hp/t 179 kW/t 4.2 kg/hp
Mercedes-BenzSLK (R172)SLK 350 V6	209 hp/t 156 kW/t 4.8 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
PorscheBoxster (981)GTS 3.4	780 km 485 mi
Mercedes-BenzSLK (R172)SLK 350 V6	845 km 525 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
PorscheBoxster (981)GTS 3.4	330 hp 246 kW	4.9 s	279 km/h 173 mph
Mercedes-BenzSLK (R172)SLK 350 V6	306 hp 228 kW	5.6 s	Unrestricted 265 km/h165 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.

Vehicle

Performance score

Practicality score

PorscheBoxster (981)GTS 3.4

Power	330 hp 246 kW
0-100 km/h	4.9 s
Top speed 279 km/h 173 mph

Doors/seats	2 doors 2 seats
Trunk	280 L 9.9 cu ft
Length	4,404 mm 173.4 in
Height	1,273 mm 50.1 in

Mercedes-BenzSLK (R172)SLK 350 V6

Power	306 hp 228 kW
0-100 km/h	5.6 s
Top speed Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph

Doors/seats	2 doors 2 seats
Trunk	225 L 7.9 cu ft
Length	4,134 mm 162.8 in
Height	1,301 mm 51.2 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

PorscheBoxster (981)GTS 3.4

Power	330 hp 246 kW
0-100 km/h	4.9 s
Top speed 279 km/h 173 mph

8.2 L/100 km

28.7 mpg US

34.4 mpg UK

Mercedes-BenzSLK (R172)SLK 350 V6

Power	306 hp 228 kW
0-100 km/h	5.6 s
Top speed Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph

7.1 L/100 km

33.1 mpg US

39.8 mpg UK

Porsche Boxster (981) GTS 3.4 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
PorscheBoxster (981)GTS 3.4	8.2 L/100 km 28.7 mpg US 34.4 mpg UK	4.9 s
Mercedes-BenzSLK (R172)SLK 350 V6	7.1 L/100 km 33.1 mpg US 39.8 mpg UK	5.6 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
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
PorscheBoxster (981)GTS 3.4	240 hp/t 179 kW/t 4.2 kg/hp	8.2 L/100 km 28.7 mpg US 34.4 mpg UK
Mercedes-BenzSLK (R172)SLK 350 V6	209 hp/t 156 kW/t 4.8 kg/hp	7.1 L/100 km 33.1 mpg US 39.8 mpg UK

Detailed score breakdown

Vehicle

PorscheBoxster (981)GTS 3.4

Mercedes-BenzSLK (R172)SLK 350 V6

Power

330 hp

246 kW

306 hp

228 kW

Torque

370 Nm

273 lb-ft

370 Nm

273 lb-ft

Acceleration

4.9 s

5.6 s

Top speed

279 km/h

173 mph

Unrestricted

265 km/h165 mph

Restricted

250 km/h155 mph

Lightness

1,375 kg

3,031 lb

1,465 kg

3,230 lb

Fuel consumption

8.2 L/100 km

28.7 mpg US

34.4 mpg UK

7.1 L/100 km

33.1 mpg US

39.8 mpg UK

Practicality

Doors/seats	2 doors 2 seats
Trunk	280 L 9.9 cu ft
Length	4,404 mm 173.4 in
Height	1,273 mm 50.1 in

Doors/seats	2 doors 2 seats
Trunk	225 L 7.9 cu ft
Length	4,134 mm 162.8 in
Height	1,301 mm 51.2 in

Range score

780 km

485 mi

845 km

525 mi

CO2 score

190 g/km

167 g/km

Trunk score

280 L

9.9 cu ft

225 L

7.9 cu ft

Power-to-weight score

240 hp/t

179 kW/t

4.2 kg/hp

209 hp/t

156 kW/t

4.8 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	Porsche Boxster (981) GTS 3.4	Mercedes-Benz SLK (R172) SLK 350 V6
Consumption	8.2 L/100 km28.7 mpg US34.4 mpg UK	7.1 L/100 km33.1 mpg US39.8 mpg UK
Cost / 100 km	14.35 LC100 km	12.42 LC100 km
Cost / 100 mi	23.09 LC100 mi	20.00 LC100 mi
Annual fuel used	1,230 L325 US gal271 UK gal	1,065 L281 US gal234 UK gal
Annual fuel cost	2,153 LC/year	1,864 LC/year