I had a 1996 Powerstroke F250 4x4, BTS E4OD. Still wish I kept it. I put a 205 degree thermostat in it. I used an Edge programmer on Extreme setting. I kept the EGT below 600 all the time and Boost as low as possible. I did slow accelerations and that seemed to help. Lots of pulse and glide and neutral coasting. Never had a Scangauge for it. I could probably do better today - maybe hit 25 mpg if I tried. Definitely get that alignment right, keep the tires on the high side - at least 70-75 psi. Tailgate up. Sometimes the wires under the valve cover burn up. Sometimes the pins for the pass thru plugs on the valve cover gaskets burn up. My 2 cents.
