I am not going to delete again for a few reasons. None of them mechanical troubles.
I was always worried if I broke down far from home I might have trouble finding a dealer to work on it. While towing it is pretty loud in the cab with a five inch exhaust even with a muffler. Lastly, I don't want to worry about the EPA fines or "fix it or ticket".
I don't feel like it was a waste of money to do, just not for me anymore.
As far as mpg, that was my main goal with the deletes. I pull about 12k and have seen anywhere between 11 to 14mpg. Empty average around town driving was 18mpg. Highway loaded full of Missouri flat rock I had 24mpg(about a four hour run). All hand calculated and no B.S.
hope this helps!