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it's hard, especially if it's new for you.  With spirited driving, (but not pedal to the metal all the time), you should get 16-17 city / 20-24 hwy.  I saw no decrease going from NA to TT (unless I got the leadfoot).  When I put a new engine in, and Sport 500's at the same time, and saw a 2 mpg increase. 
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