Pengaruh pemanfaatan Gasoline 80% dengan variasi konsentrasi Bioethanol dan Methanol terhadap daya, torsi, dan coefficient of variation pada Spark Ignition 125 cc dan Road Test Engine 1800 cc = The Effect of 80% Gasoline utilization with various concentrations of Bioethanol and Methanol on power, torque, and coefficient of variation on the 125 CC Spark Ignition Engine Test Bed and 1800 CC Engine Road Test