When you are grilling for a picnic/cookout, and you know you're going to have the grill running for an extended period of time such that a single chimney of coals is not going to last, do you dump a chimney of lit coals onto a pile of unlit or do you just dump the chimney of lit coals in, and add unlit as you go? It seems like most of what I'm seeing through Google searches suggests people add unlit as they go, but I'm wondering if there's any benefit to that over having the unlit already in there from the start...