I don't like going over 100, seems risky on a number of fronts, even on a straight section of highway with little traffic and no cops around and good visibility, good light, good roads, etc.
Change the variables and the speed comes way down. Most 2 lane roads, I may "hate it" but I'll just follow if they are doing the limit, even if I find a passing zone. If they are doing 5 under, eh, sometimes I'll pass and sometimes I won't. If I do pass, then I'll take it up to 60+ if needed, and coast back down to the limit, I really don't pay attention, it's just floor it and not let up until I am passing in a fast manner. It goes without saying that if I don't think I can pass in a safe manner then I don't pass (can't get up to speed fast enough to do it, not enough road with clear visibility, etc).
And of course, exceeding the posted limit, even while passing, is still breaking the speed limit. Yadda yadda yadda.