I guess the only way to verify these numbers would be to measure the amount drained (which I have not done).
This wouldn't help you much, as ALL engines that are working correctly, should
use approx. 1/2 to 1 qt. of oil for each normal change. So there would be no exact way to see how much oil was remaing in the engine by simply measureing what came out.
Oh, and by the way, Hello. I am new to the Traverse forum (because I just purchased my Traverse 2 days ago) but I have been around the car forum scene, and cars for over 10 years.