what I'm saying is that in the beginning I had no stamina to ride anything higher than 68GI and even then I was struggling. Fast forward 3 years of riding FG every day on hilly terrain and training 60Km everyday @ 77GI and it became confortable to me.

The bottom line of what I was trying to say is that it all depends of not only the terrain but of how fit/accustomed to hills you are.