In the face of growing requirements for reducing exhaust emissions and the need to seek more ecological solutions in the transport sector, more and more attention is being paid to alternative fuels. This article examines the potential of using fuel mixtures containing bio-components, in particular alcohols and Sustainable Aviation Fuel (SAF), as a substitute for conventional fuels. The research focuses on two key aspects: composition of the fuel mixture and exhaust emissions. The research results aim to determine whether the proposed alternative fuel mixture can be an effective and more ecological alternative to conventional fuels, while maintaining appropriate operating properties. The results of the work can be a valuable contribution to the development of sustainable fuel technologies and help reduce the negative impact of transport on the environment.