It is hard to imagine that this thread would go on this long with such strong wording from various posters.
My rig is equipped well enough to run 75 to 85 easily if I chose to do so. However I am not in a hurry and have been driving for quite a few decades with no violations. I don't drive 65 to 67 for economy only, I drive that speed due to the sudden changes in front of me. My wife, dogs and others are my responsibility and I intend to honor that.
If you want to drive 75 to 85 pulling that is your choice. I will continue driving my way and not once worry about it.