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It all depends on how you tune it. If you go small turbos and try for low-end boost you are going to lower MPG (more air requires more fuel). However, if you tune the boost to come one around 3K RPM, then moderate driving won't get you in the high air flow range. With cooling of the charge, it is safe to run a slighly leaner tune at these low RPMs, so you get better fuel ecomomy.
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New Ride -- 2015 Z06 2LZ (stock) -- Journal
Old Ride -- 2012 Camaro 2LT/RS (647 RWHP & 726 RWTQ) -- Build Thread
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