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Old 09-29-2013, 08:29 AM   #8
Denis


 
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Drives: 2010 SS
Join Date: May 2012
Location: Yorktown Heights, NY
Posts: 7,695
I have a full exhaust (long tubes, no cats, and a Corsa) with a tune and AFM turned off and noticed no significant gain or loss in MPG. on my drive from Cali to NY I averaged 25 MPG.
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