Originally Posted by stevehnm
That's the difference between you and me. I believe in reality. A test run at a constant speed on a flat and level road has nothing to do with reality.
You are absolutely correct. No one I know has ever driven on the highway using their cruise control to maintain a steady speed.
But to comport to reality, the reality that your HWY MPG number is made up of, you can change your speed regularly, as long as you do not exceed 60mph and average 48mph. Have fun with that!