Story time. A couple summers back I took two road trips. Trip 1 was a high speed jaunt with parents and siblings in two vehicles. The speed was chosen by others and was generally over the speed limit. I was exhausted by the drive. After eating dinner, all I wanted to do was get some sleep.
Trip two was just me and my son. I decided I was going to enjoy the drive, so I set the cruise control at 65 - definitely under the speed limit - got in the right lane, and let everyone blast by me. That was far less stressful, and allowed me to enjoy the evenings after arriving at our daily destination.
I also got about a 10% improvement in fuel economy, which was also nice.
—Peter