The tune will really wake up your car. Mpg will actually go up slightly, but you'll probably be having too much fun to keep your foot off the gas haha.
The biggest issue people tend to have with a tune is that it's a quick way for dealerships to try to deny warranty repairs on the engine and transmission. They still have to prove that the tune is the cause for repair, but it's usually a bit of a hassle either way.
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2012 Kona Blue 3.7L V6:
Borla LT headers, O/R h-pipe, Borla S-types, 3.73 gears,
Steeda adjustable UCA w/ mount, BMR LCAs, Airaid CAI,
LCA Relocation brackets, AE driveshaft, GT 80mm TB,
Black 18x9/10 2010 GT500 Wheels w/ Nitto NT555s,
Eibach Sportline Springs/shocks & Koni STR.T Struts