I see about 18-18.5 mpg in normal driving. As far as turbos increasing mpg, you may see a little increase in fuel economy driving around in vacuum if the tune is leaner than a stock Z. Once you put your foot into it, all mpg gains go right out the window.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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