I drove from Florida to Indiana over the last 2 days, and alternately scanned for 2m repeaters and called CQ on 146.52. I made only 5 QSO's on 146.52. One was some folks traveling on the same highway in the same direction, so we got to talk for an hour or so. (They were driving 2 cars and were using 146.52 to stay in touch.) One was a base station that I was able to chat with for a while. And 3 others were guys driving in the other direction, so the contact was brief. So there are people out there, both mobile and base, who are listening on 146.52, but I didn't hear anyone else calling on it.