oneijack is correct. The most important thing when breaking in an engine is to vary your RPM's. This is so you don't form ware ridges from constant lower RPM's in the first 500 miles. I recomend not doing over 65 mph in the first 250 to 300 miles. Let it rip for the next 200.
With constant lower RPM's tiny ridges can form in the cylinder bores. Then when you start doing higher RPM's these tiny ridges cause undue ware on the rings. It's often the cause of oil consumption higher then normal.
