It isn't the guy in my mirror that makes my speed creep up. It is my own right foot! |>)) The reason I want cruise control is to keep me from going tooooo faaaaast! My SX 2.0 (neon to you mercans) just loves to entice me into going faster and faster and faster.
If I do see a guy creeping up on my, what I try to do is speed up a bit to find someplace to fit into so neither of us are too inconvenienced. Even at 130ks, I move into the r.h. lane whenever possible. That way, I'm not struggling to get over when I see someone in my mirror.
Dan