I was out testing my new off road lights and I remembered the graphs I made two weeks ago that compared the IECON with various parameters from pedal position to mph. I found that I was getting better mileage with the RPMs a little higher than I did before but
only if the resulting engine load was lower. Afterwards I adjusted my driving habits and my mileage has improved a tiny bit from smarter pedal control. For my truck keeping the RPMs between 1800 to 2200 unless I was cruising got the best mileage. For cruising you just want to be in the highest gear possible to keep the
RPM low. I also have a 4.6L so that favorable
RPM might be lower for the 5.4L considering it is a bigger engine and has more power.