This report is part of a preliminary survey of the technological feasibility of reducing the fuel consumption of automobiles. The design changes, which are recommended for the purpose of maximizing fuel economy, have been derived after lengthy review against a series of constraints including regulatory requirements, technical feasibility, and cost effectiveness. This volume covers the following topics: Automobile systems and operational requirements interrelationships influencing economy; computation of vehicle fuel economy; test program description and results; the cost to own and operate an automobile; considerations in predicting preproduction lead time for incorporation of fuel economy innovations; fuel economy of carbureted spark-ignition engines; exhaust emissions of automotive spark-ignition carbureted engines; emission control hardware; turbocharged spark-ignited, carbureted engine; variable displacement engine; engine with reduced friction; lean mixture engines; intake port fuel injection; stratified charge engines-spark ignition; diesel engine; drive trains; tires; aerodynamics; weight; accessory drives; air-conditioning; and cooling system.


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