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This paper provides an overview of the blending techniques and analytical methods used to formulate the fuels for Phase I of the Auto/Oil Air Quality Improvement Research Program (AQIRP). Details of the base stocks and final blend compositions and properties are also included. Phase I involves the blending and testing of 30 different fuels in four different fuel matrices. The four matrices included gasoline reformulations, methanol fuels, gasoline oxygenate and RVP effects, and gasoline sulfur effects. Specifications for the gasoline fuels were very tight, with several properties being held constant while varying four main fuel properties. Another goal of the blending program was that the gasolines were to be blended from existing refinery streams and not from pure components. Nine laboratories participated in the certification of the fuels.