Its really the extra weight of the damper that hurts performance... Hmmm... Performance and tailgate damper... Well maybe the extra lift helps us old guys
So at 70mph you see a change in performance.... Best guess, and this is what airlinetech was leading you to..
Air flow sensor, oxygen sensor, plugs, wires, fuel filter, air filter... The boiled down explanation is something isnt working as it had at lower speeds, when at highway speeds you are...
Is your battery in good shape, found similar results until i desulfated and took a very long drive. I have 50k miles on mine and its a '19. I also tend to use 93octane... Local driving i am around 25mpg and highway north of 28...mix driving somewhere around 25 to 26. Fresh oil, air filter...
One observation is if the BMS objective is to improve battery life it doesnt, if it is to improve performance, it doesn't... A weakened battery state results in 20% loss in fuel performance... Just drove 4 days ... Battery is 6.5y old, while driving for the first day, mpg around 23/24 ...
I had verizon for 25y, switched to tmobile and now am on mint (20 a month annual prepay on T-Mobile)... Am out in fringe areas a ton... Found some deadspots in the Pennsylvania Allegheny range recently but otherwise tmobile has had solid coverage. Verizon tunes their network so you get...