I've got an '11 with 250,000 km on it. It plows all winter, tows our 10,000 er, I mean 9200# 34 foot triple slide TT all summer (with a Hensley Arrow hitch, obviously). It's also my daily driver, grocery getter and kids team transport. So far, I've replaced a coil pack (last year) and a cracked plastic coolant connector (my own stupid fault). I run full synthetic, of course, and change it regularly. I also top it up as hauling in the summer, we consume about half a litre every 2 to 3 thousand klics.
No mods to the engine and between it and the 6 speed, it's a beast. It could say au revoir tomorrow and it wouldn't owe me anything. Look after your 3V 5.4 and it will look after you and your family.
Just my 2c from 10 years of ownership and a quarter million extremely work oriented kilometers.
Maybe now that you own it, you can sleep easier!
PS Forgot to mention the manifolds. Yeah, if you work the truck really hard, they are going to crack. Had this issue on the F150 as well, but with the Expi I got smart and went with SS shorty headers and bolts. Since then, I'm golden. Figured I should update, though. You know, the full disclosure thing.