Not for sure the exact millage, over 200K. Yukon millage is high because of a 100 mile commute per day. Crate engine and transmission installed last year and has around 12K on them. Everything works fine. New tires with 40 miles on them and after tires I noticed the front end needs aligned. If I get time I will have that done. Vehicle was well maintained and anything it needed was done. Would not hesitate to not raise the hood and drive to California today.