I'm new to PowerStrokes and new to the forum here. I recently purchased an '06 F-250 with the famous 6.0L; it runs well but I was hoping for a little better fuel economy. Right now I'm averaging about 16MPG unloaded; at least 65% of my driving is on the highway. I've changed the oil and used a diesel additive, I use a diesel additive for lubricity and cetane, I'm not in the pedal too hard and I cruise on the interstate between 65-72; is there a mod that can help improve fuel economy? The truck is a daily driver and I tow occasionally (tow mileage is not a part of my avg).