BMW

Each of these engines are turbocharged, with direct injection and BMW's Valvetronic system, which can vary intake valve lift to both save fuel and aid responsiveness. Fuel economy ratings are an impressive 23 mpg city, 34 highway for the 528i and 20/30 mpg. Engine Auto Start/Stop also helps save fuel in stop-and-go driving by stopping the engine momentarily, then starting it smartly when you begin to ease off the brake pedal. An "Eco Pro" mode allows for more mindful driving, while a single Driving Dynamics Control selector lets the driver click between Comfort, Normal, Sport and Sport+ modes that coordinate throttle and transmission response, steering boost, stability-control intervention and in affected cars, the Dynamic Damping Control suspension (which helps combine a soft ride with crisp response when you need it) and Active Roll Stabilization (which reduces lean in cornering). Additionally, a system called Integral Active Steering is available and gives the 5-Series sedan a more nimble feel by steering--slightly--with the rear wheels