Petroleum-based fuel reserves are directly and indirectly influenced by the growing need for energy output from humans and various industries, vehicles, and equipment. It is anticipated that the cost of gasoline derived from petroleum will increase in the upcoming years. The usage of fuel derived from petroleum increases the amount of exhaust gases in the environment, which has a negative impact on both human health and the climate. This research investigates the effects of long-chain hydrocarbon like butanol on the emission characteristics of gasoline-ethanol fuel blend. The primary goal is to assess the viability and environmental impact of utilizing these alternative fuel blends. Through experimental tests on a petrol engine using various fuel mixtures, the study analyzes emissions, including nitrogen oxides, carbon monoxide, and hydrocarbons. The results suggest that gasoline-ethanol-butanol blends have the potential to improve combustion quality and reduce specific emissions, offering a promising avenue for more sustainable and eco-friendly fuel alternatives.