Sure 100k is possible and doable on hard compound, freeway driven, no traction having street tires.
BUT this is always funny to hear some bragging about tire life and others worried about the "safety" of putting an extra bag of groceries over the door sticker weights.
"I -5" or any other road in the PNW where it rains all the time and is cold is about the unsafest place in the world to have a set of 80k mile old pavement pounder tires.
Although if a person up here thinks that is ok, then they're probably hanging out at 50mph in the hov lane with all the hippies and Asian drivers and hydroplaning isn't as much of an issue if yer driving slow as molasses....
An objective takeaway though after living up here for over 5 years now is tires last MUCH longer here than most other climates. Wet pavement and low traction for the majority of the year is very kind to tire tread life.