To break in an engine (the difference between a 100k mile car and a 200k mile car):
Keep the rpms changing, do not use cruise control for an extended period of time
Do not rev above 4500 rpm or it may overstress some new engine parts (no VTEC for a while, sorry)
Change the oil and filter at 1500 and 3000 miles
Do this for the first 500-2000 miles
Congrats on your new car! And welcome to ClubCivic. I agree on the fact that 2k Si's sucked. They were as heavy as the Integra GSRs and were underpowered and undertorqued. My EX did pretty well on a sprint at high speed (100+ mph) against an Si ... it never passed me.
This is how to break in an engine:
1. Drive the car for 100 miles without revving over 3500 and with non-synthetic oil
2. Then change oil, and drive for 200-250 miles with revving over 4000
3. Change oil again and drive for about 600-700 miles and increase revs by about 500 every 100 miles.
4. Change oil and you're good to go.
It's rather painstaking but it's important for the life of the engine.
to be on the safe side..go about 1500 miles...but...1000 should be okay..too....come on guys..the 99-00 si's weren't that bad...they were pretty nice...alot stronger than my car haha...just yersterday raced the new 02 si's...didn't pull too hard on me but...still lose..