Wanted to let you know that I currently have 513,000 miles on my 5.4 gas engine and truck, bought new in December of 2004, it still has the same transmission, running gear and engine. I will advise upon reaching one million miles somewhere around 2020 would be my estimate, unless I buy new but without a stronger economy it will be some time.
Let me know if anyone has more miles than this on the original powertrain. Good day.