My take on break in is to go easy on the gas pedal, but let the engine always have easy revs..
Drive normally. and allow variation in the rpm, either by changing the speed a few mph on the freeway drives if using the cruise control, changing it a little every few miles..
Then also revving it some now and then, like on freeway ramps on to the freeway is perfect, run through first second third.. higher RPms now and then..
And once in a great while have it at high rpm and let off the gas totally and let the engine slow you down. totally different inside engine when doing this...
The RPM bursts start out with only going up th say 3,500 then a little higher, and so forth. I would Never hit peak RPMs until several thousand miles.. peak is pretty hard on an engine, and I want it totally broken in otherwise, before i would go for peak rpms..
So that is my way.
Once it is at 3,000 mi or so you can pretty much do whatever you want. it is gonna be the way it is for the rest of it's life by then... for good or bad.
Engines are peculiar. two seem identically made, but they can feel different.
I have always have good luck with engines... so far anyway LOL!!
(it's the oil, change the oil my motto...)
I do have to say I have been not doing my usual stuffas much with the Focus, because of the super gas mileage and low rpm high gearing.. So i have to say I am not even following my own advice all the time here!!
The Focus is such a super gas miser if i just try a little.....