I'm about 300 miles away from hitting the big 300,000 mile club! My truck is a 2011 so I've been putting about 50K a year on her. So far so good. Regular maintenance mainly. Still on the original drivetrain. I did have a transmission line bust on me going 70mph down the hwy. That wasn't very fun. Got the transmission flushed and a new belt put on and I was on my way. I've also had to replace the little mechanism with the hoses that fails and causes your heater to not work. I have a Borla muffler and Cajun B pipes with stock manifolds so far. So far my manifolds still seem good which I've been told is really surprising. My last titan had the manifolds crack before I even hit 200K. What's the highest mileage titan on this forum? I think I saw someone with around 430K if I recall correctly. Love these trucks!