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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.

With increased attention now being focused on controlling fuel-related intake system deposits, the need for high-performance gasolines has intensified. Certain import and domestic automobile manufacturers have expressed concern that some of today's gasolines formulated to prevent fuel injector deposits may have a negative effect on deposit control in other areas of the fuel intake system. This paper covers the development of a laboratory engine test procedure to evaluate the impact of fuel additive technology on intake valve deposits. Additive formulation has been optimized providing outstanding control of intake valve deposits with no compromise in PFI deposit control.