The only UA folks who have an inkling I'm on a MR are the TA's or RCC agents who might print cardstock BP's for the turn the night before. I enjoy their double-take

If they mention running, I mention FlyerTalk; sometimes, interesting conversations result. Flight crews never have a clue; we're just pax. I've done 5 turns this year and have never had the same crews nor have I ever seen the same people twice on-board. In fact, I've only ever seen one F/A twice (more than that); he works for SKYW up and down the different small airports in our local area and I run into him fairly often.
Mileage running is just flying. I actually like long-haul turns. No luggage, no hassles, just peace and quiet rushing through the air at 500mph. Great time to sleep
Pat