Well, I am able to use my cruise control to whatever level I want. Just last week I had to go to the airport 125 km away and our flight was leaving at 7 am and we had to be there no later than 5:30 Traffic was minimal at that time of the morning and so I set my CC to 125 km/hr and never had any problem. Of course not in EV nor B3/B5 but norm and ECO on.
I must admit that I did select SAVE when I was down to half on my battery scale knowing that I would like to use EV coming home a week later and in heavier traffic, but I was still in CC until getting to the airport. Coming home was a different story we were in the thick of traffic all the way home taking and hour and half using B5 all the ay but not much down hill but plenty of braking at an average of say 60/80 kph.
Long and short; I used CC, Saved some electric power and on getting home I managed to use 45% electric and consumed 6.9 L/100km. leaving me with just under half a tank of gas.