I just got my 2021 JLU80 with the 3.6 etorque and auto 8 speed tranny (600miles). I do quite a bit of highway driving. I was cruising, using cruise control, at 80mph on a FL highway (flat) realized I was in 7th gear and I wondered why I wasnt in 8th gear since its an 8 speed transmission. I started going down slowly 1 mph until I saw any type of change. Not until I came down to 76 mph did it shift up to 8th gear. I went up to 77 and it came back down to 7th gear. I always thought one of the points of having more speeds was to better the highway mileage, as in an overdrive. I know our Jeeps are heavy and require a lot of energy to push them along, but to lose one entire speed seems counterproductive. Thoughts?