Do I need to "break in" my 2007 Nissan Murano Engine?

I just got a 2007 Nissan Murano SL AWD. I love it so far. Ride is amazing....and incredibly quick pickup. I now have 300 miles on it. I was planning on driving it to Tahoe this weekend, which is about 200 miles away, up and over a mountain p. Its all fast freeway, but should I be "gentle" on the drive, or can I have a little fun and drive it a little faster. Is the "1000 mile break in" rule recommended for the 2007 Murano?