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  #11  
Old 09-10-2012, 07:34 PM
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Oh and to the OP, my GPS shows that the odometer is off quite a bit. GPS shows 1.16 miles for every 1 mile on the odometer. The speedometer shows 66 while GPS shows 70.
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Old 09-12-2012, 02:59 AM
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you need to have the dealer flash the ecm so it "knows" you put some larger tires on it. you will then be able to calc. your mpg with corrected numbers. you will find you lost some mpg, but not near as much as you think. i would do this before i traded out my tires.
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