Any update on this beowulf77? I have a 2020 AT4 3.0 and my mpg has always been way less than what others are getting. My truck has a little over 8k miles and currently the mpg is around 18. From the day I got it, I figured that it was a little low, but would eventually get better. Best mpg I ever averaged was around 20. I commute to work, very little if any city miles, and my average is still crap. I purchased the 3.0 for the increased mpg, but now I'm wondering if I should have stuck with one of the gasers. Hopeful you figured something out on yours.