I use the cruise control going 30 miles east on I 40 and back. It will gear down a couple of times to fifth. Flat and little to no wind cruising just under 75 mph. I love it. Very nice trip.
When I travel the turnpike to Tulsa with the long grades using the cruise control set at 77 mph all hell breaks loose. It slams down to fourth and holds there until starting down the other side of the hill. I get home and hook up with my friend J.D. to calm down. So to help some I won’t use the cruise control but it is very difficult to maintain a steady speed because it will gear down to fifth, accelerate easily back to 77 mph, shift to sixth and drop 2 to 3 mph, gear down to fifth and start over.
I have the SSP and it helps.