Ya I understand about the "Nut behind the wheel" syndrome, been there done that. I also installed Banks gauges to monitor my boost, EGT and transmission temp. Since I did that I learned to drive by the gauges.
Prior to installing the latest Banks products my mileage was about 11mpg with my trailer on. After installation it's about 14mpg.
That's to my satisfaction, but I sure would like to get it better.