11-22-09 according to your fuel log you put in new plugs, and looks like that's when mileage tanked, highest tank after that you could disregard because you said you had a vacuum leak. The 27 after that would have most likely been all highway because it was only 3 days later
Might only help if you put in some sort of aftermarket plugs, then I'd suggest getting plugs from your dealer
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