Highway where its flat. Living at 8150 feet already puts me at a disadvantage. 33s with factory rubi gears. When I move to 5.13 I'm sure my drive habits will adapt.
I'm surprised you can find a stretch of road that allows you up to 75 without dodging holes.I'll add that I use 5th like any other gear. I don't think of it as an overdrive. It's just the gear that is appropriate at that time. 75mph is 3k rpm and I do that on a regular basis.