Uh you dont break in a turbo. And yeah type of miles count. Hence why the old saying goes "high way miles are better than city miles on an engine". Constant wot pulls at 150k+ rpms is harder on the turbo than just cruising.
And by no means do I "baby" my car. She gets abused like a red headed step child.
Its the opposite though if you are breaking in a new motor, varying low rpm reduces uneven wear.