so, does nobody here uses Mun for a gravity assist? when I go to Minmus, I ussually prefer to set my course for Mun, then use maneuver nodes to plan a burn that will get my ship on a good inclination, and a good distance. Minmus, despite its eccentrical orbit, is always 46k Km from Kerbin, so, I just plot a maneuver node when already in route to Mun, and watch the resulting Ap to get it to 46K. Yes, it might be more inefficient because you have to wait for a good rendezvous, but it does seem to save some fuel.