Nuke, I integrate E discussion along the way at every opportunity, no matter what the topic is. Even merge training, or basic maneuvers training, I will often give a running dialog of E observations. For instance the tightness of a turn, or the type of turn I see from one merge to the next, gives clues on how much energy the other guy is burning in relation to yours. I'll mention things like that as I see it, and then prove the point by being able to make more verticle turns than the trainiee. I really try to stress that E=maneuver options. If you can bank just a tiny bit more E than the other guy over a series of 2 or 3 merges, you can take control of the fight because those tiny E saving measures, can add up to you have more options than the other guy as the fight speed slows down.
It is really so integrated it just about any fighter tactic lesson I give, that I don't even think about it, or have a 'script'. Implications involving E are fairly common in any aspect of air combat in aces high, and I just point them out as I see them.
Just the opposite of what was said, I have to do some arm twisting at times to convince a newer player that we were co-E at that third merge, and they were just a capable as I to pull another verticle turn...then I explain the techniques for doing it without pushing it over the edge.
Also, most of the time right off the bat, I will show the disadvantages of going for that shot on the initial merge. It doesnt take long to prove that point.