A decade ago, BMW moved to six-cylinder base engines to power its roadsters; now with better technology, it can accomplish the same–or more–power with turbocharged four-cylinders.
The Porsche Boxster is the sportiest competitor in the segment, and while you may deal with a little more interior noise, it's the best option for someone looking for occasional track use.
The Infiniti Q60 is comparatively bulky, but comes with a rear seat and a willing V-6 engine.
The Audi TT feels lean and sporty–and it costs less, too–but it comes standard with front-wheel drive and less power than the BMW.
There's also the Mercedes-Benz SLK 250, which feels bulkier than the Z4, but offers similarly frugal fuel economy numbers.
Get FREE Dealer Quotes
|2015 BMW Z4Browse Used Listings||2018 INFINITI Q60Get Your Price||2015 Audi TTBrowse Used Listings||2014 Mercedes-Benz SLK ClassBrowse Used Listings||2014 Porsche BoxsterBrowse Used Listings|
|17 MPG City / 34 MPG Hwy||19 MPG City / 30 MPG Hwy||22 MPG City / 31 MPG Hwy||19 MPG City / 32 MPG Hwy||20 MPG City / 30 MPG Hwy|
|Intercooled Turbo Premium Unleaded I-4||Twin Turbo Premium Unleaded V-6||Intercooled Turbo Premium Unleaded I-4||Intercooled Turbo Premium Unleaded I-4||Premium Unleaded H-6|
|Two-Seaters||Subcompact Cars||Subcompact Cars||Two-Seaters||Two-Seaters|
|2-Door Roadster sDrive28i||Red Sport 400 AWD||2-Door Coupe S tronic quattro 2.0T||2-Door Roadster SLK 250||2-Door Roadster|
|Rear Wheel Drive||All Wheel Drive||All Wheel Drive||Rear Wheel Drive||Rear Wheel Drive|
|Manual w/OD||Automatic w/OD||Auto-Shift Manual w/OD||Manual w/OD||Manual w/OD|
|Detailed Spec Comparison|
|2015 BMW Z4 vs. 2018 INFINITI Q60||2015 BMW Z4 vs. 2015 Audi TT||2015 BMW Z4 vs. 2014 Mercedes-Benz SLK Class||2015 BMW Z4 vs. 2014 Porsche Boxster|