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Haven't noticed a difference in performance yet as were still breaking in the car. Only 300K on it so far.
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Wow! That's lots of miles for an '09 - bet you meant 300 miles. ;)

I used to have an '06 GT and now have an '09 GT, main difference I've noticed is MPG the '06 got a solid 25, the '09 gets about 21.5 (only has a little over 500 miles). Somebody here said the '09 has a "de-stroked 3.9L" and that may account for the reduced MPG.
 
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