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Mileage drop after new plugs 850

I recently changed my NKG plugs to the volvo blister pack for my 850.

I noticed a drop in mileage, as in 2 to 3 mpg on the highway and 3 in the city.

Any idea why the blister pack plugs would decrease fuel efficiency?






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New Mileage drop after new plugs [850]
posted by  asc325is  on Wed Jun 11 18:04 CST 2008 >


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