Taking a wide-reaching portfolio approach to reducing fuel use and emissions, BMW is using any technology that yields greater efficiencies. What’s in the portfolio? Stop-start systems, regenerative braking, low rolling resistance tires, optimized drivetrains, lightweight construction, electric power steering, and even gear shift indicators informing the driver when to upshift or downshift for maximum efficiency. BMW calls these systems “efficient dynamics”—a code word for making large fast engines a little more conservative. And now beyond that, the company is adding in performance hybrids” it calls “ActiveHybrids,” more-efficient diesels, and beyond that yet more, its electrified plug-in i-Series is dedicated to sustainability.