mission level between the neat gasoline and ethanolemethanolegasoline blends, e.g., ethanolegasoline blends presented lower CO and UHC emissions than those of the neat gasoline but higher emissions than those of the ethanolemethanolegasoline blends. In addition, the CO and UHC decreased and CO2 increased when ethanol and/or methanol contents increased in the fuel blends. Furthermore, the effects of blended fuels on engine performance were investigated and results showed that methanolegasoline blends presents the highest volumetric efficiency and torque; ethanolegasoline blends provides the highest brake power, while ethanolemethanolegasoline blends showed a moderate level of volumetric efficiency, torque and brake power between both methanolegasoline and ethanol egasoline blends; gasoline, on the other hand, showed the lowest volumetric efficiency, torque and brake power among all test fuels.