Technologies for Reducing Fuel Consumption in Spark-Ignition Engines -- Technologies for Reducing Fuel Consumption in Compression-Ignition Diesel Engines -- Electrified Powertrains -- Transmissions -- Non-Powertrain Technologies -- Cost and Manufacturing Considerations for Meeting Fuel Economy Standards -- Estimates of Technology Costs and Fuel Consumption Reduction Effectiveness -- Consumer Impacts and Acceptance Issues -- Overall Assessment of CAFE Program Methodology and Design -- Appendix A: Statement of Task -- Appendix B: Committee Biographies -- Appendix C: Presentations and Committee Meetings -- Appendix D: Ideal Thermodynamic Cycles for Otto, Diesel, and Atkinson Engines -- Appendix E: SI Engine Definitions and Efficiency Fundamentals -- Appendix F: Examples of Friction Reduction Opportunities for Main Engine Components -- Appendix G: Friction Reduction in Downsized Engines -- Appendix H: Variable Valve Timing Systems -- Appendix I: Variable Valve Lift Systems -- Appendix J: Reasons for Potential Differences from NHTSA Estimates for Fuel Consumption Reduction Effectiveness of Turbocharged, Downsized Engines -- Appendix K: DOE Research Projects on Turbocharged and Downsized Engines -- Appendix L: Relationship between Power and Performance -- Appendix M: HCCI Projects -- Appendix N: Effect of Compression Ratio of Brake Thermal Efficiency -- Appendix O: Variable Compression Ratio Engines -- Appendix P: Fuel Consumption Impact of Tier 3 Emission Standards -- Appendix Q: Examples of EPA's Standards for Gasoline -- Appendix R: Impact of Low Carbon Fuels to Achieve Reductions in GHG Emissions (California LCFS 2007 Alternative Fuels and Cleaner Fossil Fuels CNG, LPG) -- Appendix S: NHTSA's Estimated Fuel Consumption Reduction Effectiveness of Technologies and Estimated Costs of Technologies -- Appendix T: Derivation of Turbocharged, Downsized Engine Direct Manufacturing Costs -- Appendix U: SI Engine Pathway NHTSA Estimates Direct Manufacturing Costs and Total Costs -- Appendix V: SI Engine Pathway NRC Estimates Direct Manufacturing Costs Alternative Pathway, Alternative High CR with Exhaust Scavenging, and Alternative EVAS Supercharger -- Appendix W: Technologies, Footprints, and Fuel Economy for Example Passenger Cars, Trucks, and Hybrid Passenger Cars -- Appendix X: Full System Simulation Modeling of Fuel Consumption Reductions -- Appendix Y: Acronym List