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That oil consumption does seem high.
If you're getting drips on the floor, then you do have a leak. (No drips when driven frequently just means the oil is getting blown around.)
I doubt that adding 1 qt of VR-1 to a full load of Castrol improved your oil consumption. Am guessing that driving habits during that time had a bigger influence.
I would swap to another oil (I use VR-1 without issue), drive it for a few hundred miles, and then do a compression and leak-down test. Please post results; we're all curious how this comes out.
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