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Based on my 2.0T, mpg is directly based on driving habits. Under normal driving with a 45mph speed limit, using 3-5 lbs boost I can get 22mpg. On the highway driving like a normal person at 70mph I can get 30mpg. On the flip side of that, if I were to get into the boost at 20-23 lbs my mpg drops to around 14. The 2.0T has the GMPP tune, putting out around 300hp / 350TQ. Even with the higher numbers from the tune, the mpg has remained the same, but now requires 93 octane.
With the ZL1 it's rated at 12/19, and driving normal and staying out of the boost, around town I can get 13 mpg and 20 mpg highway. On the flip side of that, if I get into the boost and drive stupid the mpg will drop to 7 or 8.
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