yes factory pre breaks in the engine to make sure everything works fine. i got my 350 with 7 miles

Yes, 5-6 miles is about as low as you will find straight from factor. Usually the "across the lot, on the boat, off the boat, on the train, on the truck" miles. Occasionally you will see one from the factor with 10-12 miles. It's my understanding that there is an occasional QC run on the factory track prior to shipment.

MY 2003 350Z arrived at the dealer with 6.7 miles.

Got mine with 8.2 miles on it.