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Experiments were carried out to reduce the harmful exhaust emissions from the engine through various in‐cylinder techniques such as nanoparticles blended fuel. In this present investigation, the effect of methanol‐gasoline fuel blends (M10, M30, and M50) and neat gasoline (G100) on a single‐cylinder four‐stroke SI engine was studied under idle throttle operating conditions to obtain the characteristics of total fuel consumption and exhaust emissions. The fuel‐borne nanoparticles such as aluminum oxyhydroxide [AlO(OH)] from 50 to 150 ppm were mixed with methanol gasoline blends. AlO(OH) behaves like a fire retardant which prevents detonation and knocking under a higher concentration of methanol gasoline blends. The SI engine was running without any problem using gasoline–methanol blends up to M50 under idling and acceleration. However, the engine was running under idling conditions using neat methanol (M100) and failed to run under acceleration due to poor combustion under a rich mixture. The total fuel consumption decreased with the use of methanol and significant reductions were observed on engine surface temperature, exhaust gas temperature, and the exhaust emissions such as carbon monoxide, hydrocarbons, and nitrogen oxide when compared with neat gasoline.

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