This research service discusses the key powertrain technologies that original equipment manufacturers (OEMs) will develop and employ towards 2020. It discusses the regulatory environment and the progressive stringency of standards for fuel efficiency that are driving these trends. Furthermore, it shows multiple scenarios of regulatory compliance, and the role of each powertrain technology in taking the fleet fuel-economy numbers forward to meet targets in 2020. The powertrain technologies that are used as part of future OEM strategies are analyzed and the OEMs' growth roadmaps have been plotted. The study also provides forecasts for multiple segments, fuel types, and different technologies.