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This research presents an investigation of the effects of ethanol addition to low octane number gasoline, on the fuel octane number and on the performance of the engine. In this study, the tested gasoline (octane number=90) is blended with five different percentages of ethanol, namely 3, 6, 9, 12 and 15% on volume basis. Then these fuel blends, as well as the base gasoline fuel, w ere burnt in the tested engine. It is found that the octane number of gasoline increases continuously and linearly with increasing the ethanol percentage in gasoline. Hence, ethanol is an effective compound for increasing the value of the octane number of gasoline. Also, it is also noticed that the best performance of the engine was obtained when 15% of ethanol was used in the gasoline blend.

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