Low oil level on new Subaru

We purchased a 2013 Outback 2 weeks ago and have driven mostly interstate miles on 2 trips. With only 2500 miles, the low level oil sensor light came on 4 separate times approximately half an hour a part and went off a minute or two later by itself. It was flat interstate at slightly over 75 mph. When checking the oil levels, they appeared normal the best we could tell. Two days later, the local Subaru dealer checked out the car. They could find nothing wrong and indicated it was low a half quart and topped it off. They say it is normal for the car to burn a half quart every 1000 miles and nothing is wrong. The answer does not make sense and leads me to the conclusion that during a 7500 mile oil change interval recommended that I will be 3 1/2 quarts low. This is a brand new car, not a car with 100,000 miles. Does this make sense? Regardless, it doesn't paint a good picture for Subaru quality in my mind. I sincerely hope this is not a lemon or a sign of things to come.