I remember 45 years ago, taking my CB125S on I-89 in VT & NH for about 50 miles, I was lucky to maintain 40 going up some of the hills, but traffic was different. Big trucks weren't 1000 hp, so they were going slow up the hills too. and it was also during the national 55mph days, only thing that went fast were grayhound busses
I would never, ever consider that same ride today, on my K-pipe, for all practical purposes, an identical bike