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I have a 2010 Crewmax and I'm just about ready to take the cat back exhaust plunge and install a Corsa Sport system. I'm not expecting any sort of mpg gain as a result of the exhaust upgrade. However, I've been doing pretty well on mileage (see Fuelly numbers) and I am concerned about giving up mpg's after the upgrade. I'd appreciate it if all you Corsa owners could chime in and let me know what your experience has been and whether I should be prepared for a signifigant loss of fuel effeciency. Thanks for the help!