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This paper describes a 30 vehicle test conducted to evaluate the performance of a new gasoline additive technology. The technology consistently demonstrates an ability to control octane requirement increase of automotive engines, and even effect a reduction, under standard dynamometer stand conditions. The objective of this work was to determine if a beneficial influence, relative to unadditized base fuel, on the octane requirement of a broad fleet of typical customer vehicles could be observed. Included in this evaluation is an assessment of both octane requirement increase control (ORIC) and octane requirement reduction (ORR). Additionally, data regarding inlet valve deposits (IVD), combustion chamber deposits (CCD), emissions, and lubricant properties are included.