Gas mileage will technically be better because you're not running as PIG rich as the stock tune. Most tuners will lean out the AF's....
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CURRENT: 2017 RS3 (miss you guys)
SOLD: 2012 335i Mineral Gray
M Performance Exhaust/Brakes/Suspension/LSD|Bav Stage 1/AMP||ER CP/IC/DP/OC | Dinan CAI/N55 PWG BIG TURBO|BMWF30.com
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