Ok I've got a 09 quad cab 4x4 3500 c&c aisin with a 8 foot flatbed on it. I bought it 2 weeks ago and I was doing 13.5 mpg stock with mostly town driving. I did a dpf delete and took off 3 temp probes and the two aluminum lines going to it. I left the 2 ports where those lines connect open. I pulled the plunger out of the egr and unplugged it behind the intake tube. I then loaded the 23me economy tune from the smarty jr onto the truck. I also have a airaid air filter on it. I drove about 70 miles this morning and I'm getting 14 mpg . What's the deal did I miss something? Could a dirty map sensor do this? I'm gonna try the tow tune but just taking the dpf off should have gained me something. I'm not driving it hard at all. Any advice?