For what it’s worth, after paying attention to fueling and doing a few long, hard, rides on my new bike (with a dual-sided power meter) during which I surprised myself with how fast I was, I found myself entirely unchallenged doing indoor rides on my old (now dedicated trainer) bike (direct drive smart trainer), so the power numbers come from different sources. Make of that what you may. Perhaps both of my separate power sources are suddenly reading 5% high.