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I have had the same experience.
I find that oil consumption is pretty stable at 5 3/4 qt on the rear engine and 6 qt on the front engine. Above this, the oil is quickly thrown out.
CPA has a tech-note on this. They recommend reducing the amount of oil until consumption stabilizes and using that point as your reference. Obviously, when doing this, you should keep a close eye on oil temps to make sure they do not rise. If the temps are stable, then you still have plenty of oil.
CPA indicates that, in their experience, the absolute level indicated by the dipstick is fairly inaccurate, and that the measure should be used as a relative reference.
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