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04 CTT with 90k miles.  My actual MPG is between 10.7 - 11.2.  The fancy cluster states 11.5 - 12.2.  (Usually about .8 MPG higher than actual)  Only mod I have at the moment is a Sprint Booster.  I drive mostly around town semi aggressive.

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So the MPG rating that reads out on the radio isnt all that accurate?

It is not accurate on my Cayenne.  I have the correct tire size from the factory and the cluster still shows a higher MPG than actual.  Try doing the math yourself after you fill up your gas tank and see if it is accurate for you.  I would like to know if others experience an inaccurate MPG figure on their cluster.

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