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Old 10-29-2007, 07:47 PM   #2
porschedude
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Join Date: Oct 2006
Location: texas
Posts: 131
i assme you got new plugs too. when plugs are new you would get that extra 60 miles but mpg will fizzle off slightly after the first tank of gas. i would guess you may get 340 miles for a full tank later.
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