its actually not that hard to run up 100K+ doing delivery work in just 1 year.
A friend of mine puts on 200K per year doing delivery work. He buys a new truck every 6 months, He can not have a breakdown cause a late delivery.
If it is all highway miles there will be very small front end damage from road derbies. The front end will look kind of sand blasted and there will likely be some stone chips, a city driven car will not show this due to its lower speeds.
There is no perfect rule of thumb, each vehicle must be evaluated on its own merits.