I have not plug chopped until my heat cycles are complete and i ran a tank of mix through. I choose to do 6 heat cycles, but you can do as many as you like. Everyone does it different-As stated just get it in the ball park (guess-ti-mate) then when your done with heat cycles ride easy on the first tank, then do your WOT plug chop. The others 1/4 , 1/2 chops can be done after heat cycles if you choose to do those.