What is the specified minimum octane for that engine?Well, Car and Driver did the testing for us … in the July 2019 issue … "Should you be buying Premium?"
One of the vehicles tested was a 2019 F-150 3.5 ltr ecoboost.
Going from 87 to 93 octane:
Wheel power from 360 HP to 380 HP
Wheel Torque 463 lb ft to 475 lb ft
0-60 5.9 sec to 5.3 sec
0-100 16.0 sec to 14.2 sec
1/4 mi 14.5 sec to 14.0 sec
75 MPH fuel economy 17.0 MPG to 17.6 MPG (glad I got the 2.7 ltr, I do much better).
Peak boost pressure increased 1.9 psi with the 93 octane (so the computers do control this based on knock)!
Now we know!