FrontMatter -- Acknowledgments -- Contents -- Tables and Figures -- Summary -- 1 Introduction -- 2 Vehicle Fundamentals, Fuel Consumption, and Emissions -- 3 Review of Current Regulatory Approaches for Trucks and Cars -- 4 Power Train Technologies for Reducing Load-Specific Fuel Consumption -- 5 Vehicle Technologies for Reducing Load-Specific Fuel Consumption -- 6 Costs and Benefits of Integrating Fuel Consumption Reduction Technologies into Medium- and Heavy-Duty Vehicles -- 7 Alternative Approaches to Reducing Fuel Consumption in Medium- and Heavy-Duty Vehicles -- 8 Approaches to Fuel Economy and Regulations -- Appendixes -- Appendix A: Statement of Task -- Appendix B: Presentations and Committee Meetings -- Appendix C: Committee Biographical Sketches -- Appendix D: Abbreviations and Acronyms -- Appendix E: Fuel Economy and Fuel Consumption as Metrics to Judge the Fuel Efficiency of Vehicles -- Appendix F: Details of Aerodynamic Trailer Device Technology -- Appendix G: Vehicle Simulation -- Appendix H: Model-Based Design.