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Old 05-12-2013, 12:11 PM   #9 (permalink)
nemo
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Join Date: Nov 2010
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Chief - '06 Pontiac Grand Prix
90 day: 26.7 mpg (US)

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Can't give you any information on the fe difference. It's going to be vehicle and speed dependent. If you are worried about the longevity of your car and don't have the time, place or money to repair it as others have said don't do it.

For fe just slow down try 65 instead of 75, it will help you out in the repair department also.
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