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Wow. 1 qt in 2000 miles does seem a bit high.
BUT, some have similar oil consumption rates on much newer engines and seem to never have any problem, other than just having to add oil.
If you are sure it is not leaking, I'd do nothing.
No miracle in a can is going to "fix" anything.
I can't remember the specifics, but I seem to remember reading that a clogged PCV valve can cause higher than normal oil consumption. Might want to check that.
Absent something along those lines, and assuming you are buring the oil due to rings, or valve guides, I'd just keep driving and add oil as needed.