Contents: In-use motor vehicle-related hydrocarbon emissions (Ozone noncompliance situation, Effect of volatility on HC emission factors, Benzene emission from gasoline-fueled vehicles as a function of fuel parameters); Environmental impacts (Description of model and inputs, Nationwide and non-attainment area inventory projections, Ozone air quality analysis, Benzene emissions and incidence analysis); Vehicle controls (Technology, Costs, Conclusions); Technological feasibility and cost of in-use volatility control (Refinery control of gasoline volatility, The Bonner and Moore studies, Refinery costs of volatility control, Effect of RVP control on the Butane market); Analysis of alternatives: Gasoline; Analysis of alternatives: Alcohol blends (Industry economics and blend RVP, Emission effects of blend usage, Effect of RVP control on alcohol blends, Gasohol control options, Methanol-blend control options).