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03-15-2008, 11:11 AM
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Gas Mileage
Any one with the GMPP exhaust installed noticed an increase or decrease in gas mileage? I am looking to increase my MPG some with gas prices going up and up.
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2006 Tan Cobalt LT Last edited by cobalt81; 03-15-2008 at 02:47 PM. 
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03-15-2008, 09:27 PM
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Full bolt-ons averaging 32-34 mpg mixed city and freeway.
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 2005 Cobalt LS: K&N intake w/ GMPP Pre-filter, LE5 intake manifold, LSJ exh manifold, LSJ downpipe, GMPP sport exhaust, Eibach Pro-Kit springs, Kosei K-1 wheels, DC Sports strut bar, Corbeau bucket seats, tinted windows, short antenna, partial rear debadge, 2006-present GM fender badges, stainless steel suicide knob, PIAA bulbs 
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03-15-2008, 09:31 PM
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with the mods in my sig i average 38 mpg on the interstate. doing 70
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Linear Mode
