I have been told that I need to do the EGR delete but I still have warranty left on my truck for another 50k miles, I know doing that is going to screw with my warranty. I am tired of 14mpg and just wonder if I should chance not having to use my warranty and do it or just wait it out. I did blow head gaskets at 21k miles so I did have Ford replace the studs with ARP ( at my cost) and the oil cooler has been replaced as well, so I don't know if it would be safe to say nothing else will go wrong. I have to throw my .02 in about the smoke crap, I don't want my truck to smoke it is too darn expensive for fuel to just blow it out the exhaust. I was told once when I got on it that I had alittle haze come out and I about crapped because I don't want that. It seems people are just buying diesel's now because they want to smoke instead of just loving the truck. When I bought mine I had no idea that it was the cool thing, I have always loved trucks and my dad had always had Ford diesels so I didn't know any better. Sorry soapbox.
I would leave it until your warranty is done.. When you delete it, it's not going help with MPG anyway.. If you get on your truck once in a while it's going to smoke until it cleans the EGR valve out and then will clear out.. Soot builds up in the valve when the truck idles or when the motor isn't working very hard.. Best thing to do if you use your truck as a DD is to WOT it a few times a week to keep the valve and the turbo working properly..