Compare 2015 BMW Z4 vs 2015 Mercedes-Benz SLK Class vs 2015 Porsche Boxster

2015 BMW Z4
X
2015 Mercedes-Benz SLK Class
X
2015 Porsche Boxster
X
Select style
2-Door Roadster sDrive28i
Style MPG City MPG Hwy Invoice MSRP
Z4 2-Door Roadster sDrive28i 22 34 $45,535 $48,950
Z4 2-Door Roadster sDrive35i 17 24 $52,895 $56,950
Z4 2-Door Roadster sDrive35is 17 24 $61,035 $65,800
Select style
2-Door Roadster SLK 250
Style MPG City MPG Hwy Invoice MSRP
SLK-Class 2-Door Roadster SLK 250 22 32 $40,874 $43,950
SLK-Class 2-Door Roadster SLK 350 21 29 $53,615 $57,650
SLK-Class 2-Door Roadster SLK 55 AMG 19 28 $65,937 $70,900
Select style
2-Door Roadster
Style MPG City MPG Hwy Invoice MSRP
Boxster 2-Door Roadster 20 30 N/A $51,400
Boxster 2-Door Roadster GTS 19 26 N/A $73,500
Boxster 2-Door Roadster S 20 28 N/A $63,300
Pricing
Invoice Price
$45,535
$40,874
N/A
Manufacturer Suggested Retail Price
$48,950
$43,950
$51,400
Monthly Payment Estimate
$816 / month
$733 / month
$857 / month
The Car Connection's Take
TCC Rating
7.8
8.2
9.0
TCC’s Bottom Line
The 2015 BMW Z4 is on the pricier side of the roadster segment, but it offers a nice blend of comfort, sport, and technology. The 2015 Mercedes-Benz SLK-Class combines mini-SL style with a choice of efficient or potent powertrains, but it's better suited to cruising than corner-carving. The 2015 Porsche Boxster is a relative performance bargain, combining everyday usability with a balanced chassis and sweet engines.
TCC Likes
TCC Dislikes
Fuel Economy
City
22 mpg 22 mpg 20 mpg
Highway
34 mpg 32 mpg 30 mpg
Vehicle
EPA Classification
Two-Seaters Two-Seaters Two-Seaters
Interior Dimensions
Passenger Capacity
2 2 2
Front Shoulder Room (in)
53.3 52.2 51.7
Front Leg Room (in)
42.2 42.5 42.6
Front Head Room (in)
39.1 39.1 38.6
Passenger Volume (ft³)
- 48.8 -
Front Hip Room (in)
- - 53.4
Exterior Dimensions
Track Width, Front (in)
59.5 61.4 60.1
Length, Overall (in)
166.9 162.8 172.2
Height, Overall (in)
50.8 51.2 50.5
Track Width, Rear (in)
61.4 61.6 60.5
Wheelbase (in)
98.3 95.7 97.4
Width, Max w/o mirrors (in)
70.5 71.5 70.9
Min Ground Clearance (in)
- - 4.3
Cargo Area Dimensions
Trunk Volume (ft³)
8 6.4 9.9
Brakes
Drum - Rear (Yes or )
NA NA NA
Brake ABS System
4-Wheel 4-Wheel 4-Wheel
Disc - Rear (Yes or )
Yes Yes Yes
Rear Brake Rotor Diam x Thickness (in)
11.8 11.8 11.8
Brake Type
4-Wheel Disc 4-Wheel Disc 4-Wheel Disc
Rear Drum Diam x Width (in)
NA NA NA
Disc - Front (Yes or )
Yes Yes Yes
Front Brake Rotor Diam x Thickness (in)
13 12.7 12.4
Fuel Tank
Fuel Tank Capacity, Approx (gal)
14.5 18.5 16.9
Steering
Turning Diameter - Curb to Curb (ft)
35.1 34.5 36.4
Steering Type
Rack-Pinion Rack-Pinion Rack-Pinion
Tires
Front Tire Size
P225/45VR17 P225/45YR17 P235/45ZR18
Spare Tire Size
NA Compact NA
Front Tire Order Code
NA NA NA
Spare Tire Order Code
NA NA NA
Rear Tire Size
P225/45VR17 P245/40YR17 P265/45ZR18
Rear Tire Order Code
NA NA NA
Weight Information
Base Curb Weight (lbs)
3263 3241 2888
Wheels
Spare Wheel Size (in)
NA Compact NA
Rear Wheel Material
Aluminum Aluminum Aluminum
Rear Wheel Size (in)
17 X 8 17 X 8.5 18 X 9
Front Wheel Material
Aluminum Aluminum Aluminum
Spare Wheel Material
NA Steel NA
Front Wheel Size (in)
17 X 8 17 X 7.5 18 X 8
Electrical
Maximum Alternator Capacity (amps)
170 - 120
Cold Cranking Amps @ 0° F (Primary)
- - 340
Engine
SAE Net Torque @ RPM
260 @ 1450 229 @ 2000 206 @ 4400
Engine Order Code
NA NA NA
Displacement
2.0 L/122 1.8 L/110 2.7 L/165
SAE Net Horsepower @ RPM
240 @ 5000 201 @ 5500 265 @ 6700
Engine Type
Intercooled Turbo Premium Unleaded I-4 Intercooled Turbo Premium Unleaded I-4 Premium Unleaded H-6
Fuel System
Gasoline Direct Injection Gasoline Direct Injection Gasoline Direct Injection
Mileage
Fuel Economy Est-Combined (MPG)
26 26 24
EPA Fuel Economy Est - Hwy (MPG)
34 32 30
EPA Fuel Economy Est - City (MPG)
22 22 20
Transmission
Final Drive Axle Ratio (:1)
3.08 3.27 3.89
Third Gear Ratio (:1)
1.31 1.92 1.46
Trans Type
6 6 6
Fifth Gear Ratio (:1)
0.81 1.00 0.97
Trans Description Cont. Again
NA NA NA
Reverse Ratio (:1)
3.35 3.42 3.33
Second Gear Ratio (:1)
2.06 2.86 2.05
Trans Order Code
ZMT NA NA
Fourth Gear Ratio (:1)
1.00 1.37 1.13
Trans Description Cont.
Manual w/OD Manual w/OD Manual w/OD
Seventh Gear Ratio (:1)
NA NA NA
Drivetrain
Rear Wheel Drive Rear Wheel Drive Rear Wheel Drive
Sixth Gear Ratio (:1)
0.68 0.82 0.84
First Gear Ratio (:1)
3.68 4.38 3.67
Summary
Body Style
Roadster Roadster Convertible
Vehicle Name
BMW Z4 Mercedes-Benz SLK-Class Porsche Boxster
Suspension
Suspension Type - Front (Cont.)
Strut Strut Strut
Suspension Type - Rear
Multi-Link Multi-Link Strut
Suspension Type - Rear (Cont.)
Multi-Link Multi-Link Strut
Suspension Type - Front
Strut Strut Strut
Emissions
Tons/yr of CO2 Emissions @ 15K mi/year
6.8 6.8 7.4
EPA Greenhouse Gas Score
- 6.0 -

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