The break-in for new cars nowadays is a bit different than what it used to be years ago. The owner's manual on the '04 Accord states the following for the break-in period:

* Avoid hard braking for first 200 miles
* Avoid full throttle starts and rapid acceleration for first 600 miles
* Do not change oil until the scheduled maintenance time

From what I remember from past cars (more than 10 yrs ago), it was also recommended that you:
* Avoid using the cruise control for first 1000 miles
* Avoid driving at a constant rate of speed for first 1000 miles
* Avoid revving engine into upper rpm ranges for first 1000 miles

So my question is.... does anyone actually know what it is about modern engines that the suggested break-in period is shorter and it doesn't seem to matter if you're on the highway using the cruise control a lot?