This work presents a ground-breaking advancement in the high-throughput measurement and understanding of room-temperature ionic liquids (RTILs) both in their pure form and in combination with ethylene glycol (EG). By developing a comprehensive theoretical framework, we successfully elucidated the behavior of ion mobility and its impact on the ionic conductivity of RTIL-EG mixtures. Notably, our study revealed that the length of the alkyl chain in the RTILs inversely correlated with their conductivity,