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This paper is the fourth and final paper in a series providing fuel blending and analysis data for the Auto/Oil Air Quality Improvement Research Program (AQIRP), essentially detailing the work of the Fuels Blending Subcommittee (FBSC) and portions of the work of the Fuels Analysis Subcommittee (FASC). This paper covers fuels for the final follow up projects in Phase II. Blending procedures, feedstock preparation and analytical techniques are explained, and blend recipes, full physical properties and compositional data are given. In addition, a survey of commercial gasolines carried out in cooperation with the MVMA (Motor Vehicle Manufacturers Association) is reported. Regional and national fuel sampling and subsequent derivation of composite fuels is explained briefly, and fuel analysis data produced by the FBSC are presented. Papers by Pahl and McNally (1)*, Gerry et al. (2), and Kopp et al. (3), have presented the corresponding data for the forerunning Phase I and II AQIRP work.

This paper presents fuel property data and associated analytical methodology used in blending test fuels for portions of Phase I and Phase II of the Auto/Oil Air Quality Improvement Research Program (AQIRP). Information presented in this paper supplements the first published report of AQIRP fuel blending results by Pahl and McNally (1).* Fuel blending data are presented covering two segments of Phase I of the Program. The first is a two fuel matrix where the sulfur level is varied at two levels (50 and 450 ppm) through the addition of ditertiarybutyl disulfide. The second is an eleven fuel matrix where the effects of both volatility adjustment and oxygenate addition are investigated. Oxygenates tested include MTBE (methyl tertiary-butyl ether), ethanol, and ETBE (ethyl tertiary-butyl ether). Fuel volatility adjustments are made by changing RVP (Reid Vapor Pressure). Included with the fuel physical property data are individual fuel speciation profiles for all Phase I fuels.