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Even then, the difference between 85 and 112 is a rather large one.

Also, while the speed limit on I-40 through Arkansas is nominally 70 or 75, it's not at all uncommon for traffic to be moving at 85-90 MPH.

In Texas 85 is a thing. At that speed, you really don’t see much speeding. Maybe up to 90. And an occasional need to burst up to 100. Many people start feeling uncomfortable at these speeds even in open road conditions.

I think part of it is they also don’t want people to hit the limit often. It’s for egregious drivers. Driving at that speed and suddenly decelerating to a stop is not the safest thing either.

I've done 120 or 130 on the stretch between Wendover and Salt Lake City. Most people go about 90

Heh, yeah, that area is perfect for high speed driving. Mostly perfectly straight, good quality roads, and excellent visibility. There's an annual race in Nevada not too far from there (highway 318) that's the world's fastest road race. Last year someone average 219mph and was doing 4 wheel drifts at over 200 mph on the sharpest (almost straight at normal speeds).

Not bad for a normal highway.