Give or take a few months for a solid tune
Depends what gears the truck is suited to. 3.73 with 35s would be decent, nothing too drastic in power losses but id still wait on a tune and 4.56 gears before 35s.
Id like to see what numbers this truck does in everyday driving situations hp/tq and mileage wise, then again on a tune. If this truck really does pull mid 20's in stock form, I'd hope for the about the same tuned and on 35s
With the new ratings I don't know that will happen but we can all be optimistic. I will probably wait out 2011 for the ecoboost before trading mine in. I'd like to have it tuned from the start with some 35s