I generally do the same. I set the cruise. However, in May I went to Austin to help a friend bury her son (horrible story) on a Sunday. Headed back to Ft Worth I slid in behind a Mustang GT350 who was in the left lane of 35 (three lanes each direction) who was driving rather "exuberantly". I locked in at about 8 car lengths. We still had to move around slower vehicles on occasion, but I was surprised at how many people moved over.