I run Bridgestones at 26. I arrived at that figure because I could see that the tire was crowning at 30 (center was higher than the edges) so I lowered the pressure to minimize it.Around 30. That's mostly highway miles, not much around town, so lots of steady cruising in the 70+MPH range. And one other thing: I set the suspension camber closer to zero degrees than the Ford specs, so I wear out the tires more evenly, inner edge to outer edge. At the factory settings, with more negative camber, you'll wear out the inner edges first, and have to replace the tires sooner.
Do you have the current part numbers for both front and rear? It's time for a new set of tires for me.They could only promise they would be no older than 2019. Ordered thru Discount tire (exact same price as Tire Rack) . The part numbers have changed since a couple years ago.