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The global practice of blending bioethanol with petroleum fuels serves the dual purpose of reducing fuel costs and mitigating vehicular emissions. However, variations from the stipulated amount of bioethanol in petroleum fuels can be detrimental to engine longevity and performance. Notably, portable analytical devices capable of swiftly and accurately assessing fuel samples without necessitating prior pretreatment have been developed by researchers. This review aims to elucidate the advances and prevailing trends in analytical tools such as electrochemical, spectroscopic, electrical, optical fiber-based, and physical parameter-based techniques for the determination of blended fuel composition. [ABSTRACT FROM AUTHOR]