I did a full DPF delete on my 2010. Also did the egr kit from H&S. Put on a Turbo back 5 inch with muff. Still waiting on the tuner for the 2010 so the tranny seems to be a bit confused. But I am seeing 2 to 4 MPG better. But I still only get about 14 in town. 16 to 17 on the road. This is across a whole tank, not inst.