Sigh....you should really search for previous break-in threads. It's been gone over a thousand times....
1)Go any speed you want The ony stipulation is that you varying the speed for the first 1k miles. If you want to floor it off the line go ahead.
2)The piston seals are seated stright out of the factory and with new model engines there is no break-in oil, hence no need for special break-in fluids. So you don't need to change your oil after the first 500 miles or something.
You can go over 60 if you want, just don't set it on 60 for for 3 hours straight.
And last but not least, if you don't want throttle lag after your breakin, drive it how you will drive it when it is broken in. If you drive like grandma to try and protect the engine for breakin, then your car's computer will learn that and it will respond to those driving habits over time. Hewnce why some people complain there is a loss in throttle response after they break it in, compared to when they drove it off the lot.
A lot of that advice came from a few Ford Salesman...but take it as you will. You car is under waranty for three years...keep tha in mind.
