Since our trips tend to be several weeks apart, we drain when we got home then refill to about 2/3rds before the next trip (depending on planed distance).
Anacortes is in the top five cities nation-wide for water quality and we've run into some pretty skanky city water at some CGs, s we;d rather have the good stuff for drinking and cooking.
If we decide to keep the MH and continue the lifestyle, I might put a solenoid valve in that would enable us to switch between CG water for showers and bathroom use, then switch over to the potable tank if we're going to drink it, make tea or coffee or cook with it.
Frank and Eileen
No longer RVers or FR owners