From what I've heard from other members, new O2 sensors can give a huge improvement in gas mileage. What's amazing is that your mileage has improved that much while having the additional hp from the maganflow high-flow y-cat and V.4 chip update.
-Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato
2013 Cosmic Blue 5spd Evo X GSR
2006 Galaxy Gray 6MT RX-8 (sold)
2006 Steel Gray WRX TR (sold)
1996 Brilliant Red SVX L (sold)
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