Based on EEG stress index extracted from actual EV (electric vehicle) driving experiment, TRUE lab observed how operational and physiological data are related to EV driving stress. The plots below show the relationship between EEG stress index and remaining driving range (RDR), velocity, altitude and gazing rate of each 1/100 progress of the experiment. The subjects didn’t show common trend but some of them had significant aspects which can be the evidences of well-known suspicions. In the upper set of plots, driver’s stress increases as remaining driving range decreases below around 40 km. And other operational data doesn’t show any significant trend with stress. Therefore, we think this subject felt ‘range anxiety’ for driving EV. On the other hand, the other set of plots implies that subject felt more stress when she drove uphill road at high altitude. TRUE lab will apply a certain technique to analyze those non-linear relationships quantitatively.