Used EV residuals are sliding faster than ICE

Been tracking trade-in quotes on my three-year-old EV and the numbers are grim: down roughly 40% from what the same car fetched last spring, while petrol equivalents have held up much better. The dealer blames a wave of lease returns plus price cuts on refreshed models. Curious whether others are seeing the same in their markets or if this is a local quirk. Is this a temporary glut or the new normal for residuals? Also interested in which auction data sources people actually trust for setting expectations before they sell.