The higher the score, the cleaner the vehicle's emissions are.
2012 BMW Z4 Overview
The 2012 BMW Z4 comes in three models, sDrive28i, sDrive35i, and sDrive35is. (In current BMW nomenclature, sDrive refers to rear-wheel drive. However, there are no xDrive all-wheel-drive Z4s.) BMW Z4 sDrive28i ($48,650), is powered by a 2.0-liter, direct-injected twin scroll turbocharged inline 4 cylinder engine that makes 240 hp and 258 lb-ft of torque. Transmission choices include a 6-speed manual or an 8-speed automatic.