A decade ago, BMW and Mercedes-Benz has gone to six-cylinder base engines for their roadsters; now with better engine technology—especially turbocharging—they're returning to fours.
Like the Z4 28i, the Mercedes-Benz SLK 250 offers strong fuel economy, although the SLK tends to feel a bit bulkier.
The Infiniti G37 is also at the portly end of the scale, although its strong V-6 is an asset.
The Audi TT is more of a sports car in its current generation and is a lean-feeling alternative that costs less.
The Porsche Boxster stands as the most serious sports car in the group, and it's probably the top choice for those who also plan to take their car out on the track once in a while; the only disadvantage of the Porsche is that you get a little more interior noise.
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 2013 BMW Z4Browse Used Listings |  2013 Audi TTBrowse Used Listings |  2013 Mercedes-Benz SLK ClassBrowse Used Listings |  2013 Porsche BoxsterBrowse Used Listings |
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| Quick Specs | |||
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The 2013 BMW Z4 is spirited and purposeful, and balances fun and comfort quite well, but it's pricier than other roadsters. |
The 2013 Audi TT RS is the star on track, but all TT models offer fun and efficiency, plus a welcome dash of style. |
The 2013 Mercedes-Benz SLK is the least polarizing of the roadsters, but there's enough urgency to go with its elegant, mini-SL charm. |
The 2013 Porsche Boxster is one of the most fun, stylish, and luxurious roadsters available. |
| MSRP From | |||
| $47,350 | $38,650 | $42,900 | $49,500 |
| Gas Mileage | |||
| 17 MPG City / 34 MPG Hwy | 18 MPG City / 31 MPG Hwy | 19 MPG City / 32 MPG Hwy | 20 MPG City / 30 MPG Hwy |
| Engine | |||
| Turbocharged Gas I4 | Turbocharged Gas I4 | Gas I4 | Gas Flat-6 |
| EPA Class | |||
| Two Seaters | Subcompact Cars | 2 Seater | Two-Seater |
| Style Name | |||
| 2-Door Roadster sDrive28i | 2-Door Coupe S tronic quattro 2.0T Prestige | 2-Door Roadster SLK 250 | 2-Door Roadster |
| Drivetrain | |||
| Rear Wheel Drive | All Wheel Drive | Rear Wheel Drive | Rear-Wheel Drive |
| Passenger Capacity | |||
| 2 | 4 | 2 | 2 |
| Passenger Doors | |||
| N/A | N/A | N/A | N/A |
| Body Style | |||
| Convertible | Coupe | 2 Door Roadster | Convertible |
| Transmission | |||
| Manual | Automatic w/Manual Shift | Manual | Manual |
| Detailed Spec Comparison | |||
| 2013 BMW Z4 vs. 2013 Audi TT | 2013 BMW Z4 vs. 2013 Mercedes-Benz SLK Class | 2013 BMW Z4 vs. 2013 Porsche Boxster | |
