I used to live in Camden so I drove it a lot, and from Portland Route 1 is almost always faster, but especially if you can do it at night after the traffic is gone--just be sure you have plenty of gas after Brunswick--most of the stations close early! Someone was talking about the distances of Belfast vs. Rockland and via Google it is about 25 miles shorter to Rockland (via Rt. 1) and takes almost a half hour less. Google takes you up to Rt. 202/3 to get to Belfast from Portland, which makes sense. I have found Google's driving directions are pretty accurate on speed if you don't dawdle--you have to keep moving to keep up with the Google time.