This document summarizes a study that used computational fluid dynamics (CFD) simulations and engine experiments to analyze the performance and emissions of an internal combustion engine running on blends of gasoline and n-butanol. The CFD model was created using AVL Boost software and simulated blends with 0%, 10%, 20%, and 30% n-butanol by volume. Experimental validation was also conducted on a four-cylinder spark ignition engine. Both the simulations and experiments showed reductions in hydrocarbon emissions but increases in oxides of nitrogen emissions for the n-butanol blends compared to gasoline alone. The document reviews other research on butanol-gasoline blends and details the equations used in the CFD model to simulate combustion and