Steven..........
Actually you don?t use up much of the tag at all. Maybe three inches.
You pull the tag off the tool and then the knot slides down to the eye of the hook.
I would consider that using up the tag end is of no consequence anyway. Tippet material is relatively cheap and expendable. And tippets are easily attached now-a-days with a three turn surgeon?s knot.
DickM.