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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.