See MC Garage on YouTube. Ari Henning did a section on just that subject. Mfg Break-in vs. ride it like you stole it break-in.
End result, no difference. so get on that freeway... just don't over rev engine.
I read an article a while back about breaking in procedure. This was related to super sport bikes, but I will always remember one line that went.........."you won't break in a chainsaw chopping match sticks"