Not trying to start anything but who honestly drives their modified 80 75 plus? Mine has the minimum modifications and I roll on the highway at 60-65.
I drive 70-85 MPH every day. It take a while to get up to that speed, so I like to keep it there when I am. I draft behind trucks and other cars when I can.
Depending on the trip and the urgency, I will run close to 95. We have a few sections of highway that are 75 MPH limits and I typically run 9 MPH over, so that would be a consistently held 84 MPH for two hours at a time, with bursts to 95 for passing as necessary.
I watch well ahead of where I am in traffic so I can plan my route accordingly around all the other "rocks in the stream". I consistently use my turn signals, run with my headlights on, always wear my seatbelts. I just like speed.