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Since mpg is relative to driving habits, etc., the best comparison for me is relative to my 2010 SS L99. My avg miles per hour for a tank is around 37 with a mix of city and two lane highway. The L99 stock averaged 20.5 mpg after break in. Modded (intake, LT headers, Corsa, and JRE tune) it averaged 18.5 mpg.
My first tank on the Z was 16.6. The next was 17.6. And it looks like it will end up settling at 17.5 - 18.0 under the same conditions. Not bad at all considering an additional 130 -180 HP.
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