It's going to make almost no difference at touring speeds. Every 10mm wider tire gives you an extra ~70cm2 frontal area, turned into a square would be 8.4x8.4cm, equivalent to about 1/4 the wind resistance of hanging one front pannier. Wind resistance isn't a major factor in tire width selection for touring because we're barely breaching 20km/h.
Not sure about watts, maybe you could find something via Google where someone's done some wind tunnel testing. Most of the product manufacturers wind tunnel test at 50km/h to amplify their marketing spin. Not sure if anyone has ever tested at 20km/h. It'll probably be some absolutely tiny number, like less than one watt.
You have continually argued an aero narrative in this thread. And after all that, you post the above comments.
Classic.