I'd be glad if I never see any issues with the def and egr. I have almost 2k on it and the def tank still says 3/4 full. Fuel mileage is 14-16 city and 22-24 high
When you are not towing DEF usage should be really low. I drive a 2016 Duramax daily(work supplied) and with no Load I almost forget that it ever takes DEF because it uses so little.
We have had several DEF pickups at work and have had very little trouble with the emissions system. Our only DPF problem was on a ford with 220K miles on it and it got coolant all over it from a bad EGR cooler.
