MPG drop after first oil change

No difference in driving habits?

I’ve been messing with the tripscreen and resetting it to see how speed, accel, altitude change affects it. It’s pretty significant, even the difference between 65mph and 75mph

14 MPG sounds about right. Log miles and fuel over a long time. More useful and accurate.

surly Bill said:

Never trust the MySuk onboard mpg, use hand calculation for actual mpg.
Might not be the level of deceit of the software to fool EPA about emissions, but I suspect a conspiracy to present rosy images of higher MPG than actual to the owner.
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My 2012 F250 consistently claims I am going about 3-4 miles faster than I actually am, and shows a fuel consumption that is about 1-2 mph less than is actually being burned. I have confirmed that the tires are the correct size, and verified distances and speeds with gps and stopwatch, as well as highway speed check zones. One possibility is that my fuel economy computer is consistently and reliably faulty. Another possibility is that it is operating exactly as Ford wants it to operate. You decide.