Originally Posted by Zeeper
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!
You are full of ???? I drove hwy 5 from Sacramento to LA and back on cruise control 95% of the time. Best I got was 29-31MPG avg 70MPH but that was with 4 people and 2 large suit cases in my 2012 CVT. About 800 miles round trip.