There is a definite change in tune that are mileage driven, but its usually to get better performance not worse as limits were changed in my Focus RS which is also an ecoboost when it reached the end of the break-in
Its not performing as it did for sure, weather was the same during the mileage drop, I live in Washington State so moderate temps, driving habits have not changed
I hit 8500 miles and my overall mileage went from around 23.x to 18.x no idea what is going on, took it to ford dealer and they had it a week and could not find anything wrong, anyone seen this behavior yet ?