In the UK 80-90 was quite normal 25 years ago, and off peak you'd find the outside lane of the M40 doing over 90 a fair amount
It's not today as there's far more traffic. It's rare to have the opportunity outside of a few areas (south of Bristol on the M5, north of Kendal on the M6 etc). When I first learned to drive I'd do M62 to M5 in well under an hour, today it's about 20 minutes longer.
