Truck shows ~17.4 AVG on either "full syn" (from the oil change places) or PUP 5-30. When I ran PP 5-20, I got upto ~19.5 AVG.
Paper shows about 16 on full syn/Pennzoil ultra plat 5-30. Paper was showing 17.5-18.2 on Pennzoil Plat 5-20.
The Pennzoil changes have also been with a BilletTech catchcan, which caught almost a cup worth of oil in about 7k.
My truck is looking at 70k pretty soon (was going to say "knocking", but realized in this forum that would be a different thing...), and I did plugs around 55k, as someone told me to keep an eye on the MPG, and when it suddenly drops like a stone... They didn't know my wife's driving... Florida trip, she drove one leg, worst economy I've seen since I got the truck in '18. As in lowest I have gotten was 16 (truck), and that was a lot of short city. She did highway, and got 14 (truck)!