An improper break-in usually leads to oil consumption throughout the life of the car. But unless you're a maniac, or some other maniac drove it before you, don't worry about it. Break-in of modern engines is hard to mess up. It pretty much takes care of itself. Your 90mph excursion likely made no difference.
Interesting reading. He claims there's a very small window of opportunity to get the rings to seal really well ... the first 20 miles!! At the time of delivery almost 80 km was in my car, so I lost this window of opportunity...