I listened to one of the top pilots in the US say he uses mix and leaves it on all the time also explaining why. (It made a lot of sense to me) Truth or Fiction, only he knows for sure but his explanation sure sounded a lot like Dan's above. I don't really know any of you guys here on the forum; maybe someone is Andrew Jesky or some other big name but when I tried this gentleman's suggestions I was very pleasantly surprised.