I cruised 85+ mph when I did almost 100 miles daily. Granted, I never rode without in-ear headphones, but never 'felt' the bike was working too hard between my legs. Bike runs much cooler at speed than urban stop and go, too.
80 is the sweet spot (which is more like 75 actual) cause the aero drag and buffeting above 80 increases dramatically (with the bags on). It's exhausting to do extended hauls 85+. This is not a streamlined GP bike. It's an up-right, shoulders in the wind stance. The front gets scary light the closer to 100 you go. Get above 90 and tug on the bars just slightly back and forth...feels like you have an old Cadillac's power steering system.