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It has gradually gone up but the biggest gas mileage adders were modifying the exhaust system. Full Race systems open it up so much that i went from 31-32 at 75 to 40+
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2012 Audi Q7 TDI S Line ABTuning 391whp588wtq
01 Turbo Focus 300+ whp
2012 Focus 19" Niches, AEM CAI, F2 Race Header, 3" Borla Dual Exit, H&Rs, Eibach Sways 183whp157wtq
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