I changed the FF on my 14 Mustang GT when the car was a year old from when it was built, not when I bought it, as it had sat on the lot for six months. I had 4,600 miles on the car when I changed the oil.
The second oil change was done a year later when the OLM said 2% oil life left and the dash display said "change oil soon" I had 6,600 miles on that oil fill.
With an 8 quart sump, I have no problem going by the OLM, even though this is a performance car. Next month I will have had the car two years with 13,000 miles on it and the car runs quiet, the oil stays clean on the dipstick, and looking down the oil fill hole, everything is spotless.
I just don't worry about this oil stuff anymore like I used to when I first joined this site many years ago.
Wayne