Honestly I doubt you will increase your mileage much with a tuner on a DPF equipped truck, It will as Arron stated cause more regens and possibly cause damage to the DPF its self. There are several ways you can delete the DPF and that alone (with tuning) will be where you can get your biggest bump in fuel mileage. I was under the impressing that the LMM did pretty good on fuel stock, I know my 6.7L Cummins topped out a 15 hwy stock, city ave was 13.5., now it does 18 city shrugs )
A forum community dedicated to Diesel engine owners and enthusiasts. Come join the discussion about performance, builds, ecodiesel, towing capacity, modifications, classifieds, troubleshooting, maintenance, and more!