I would not rely on most factory recommendations, such as the one stated for a Toyota. They will normally consider high oil consumption rates "OK" as this is partly a financial decision as they may need to perform a repair under warranty.
I think a good running average based on experience is best. And I would not be concerned if it fell below 1000mi/qt. As it gets to 500mi, then I would be a little more concerned and even more annoyed
