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You should handle that... especially if you have to use higher than piss-water octane.
Basically, if you can't run on 87 octane, part of the reason could be b/c you're burning small amounts of contaminants in your intake due to a clogged/impassable PCV system.
For the few dollars it costs to diagnose/fix, you could get like 10% better mileage out of it. It's worth looking into.
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