I have an 07 CTD 4 x 4 with smarty etc and it gets pretty good gas mileage. I also bought an 09 gmc duramax and i get 14.5 mpg highway...im interested in trading it in on a 2010 CTD but was curious on what the gas mileage was? Also, have they come out with DPF deletes for the 2010s yet and how expensive are they? How much will a DPF increase the gas mileage? I know they make them for the Duramax but im interested in getting rid of it anyways so there is no point in putting more money into the truck.