I noticed a 1MPG gain (about 20 miles per tank) with my K&N drop-ins but it may be just because I needed to replace filters anyway. My 16-17MPG is normal for me because I drive in the powerband most of the time and like to "get after it" on ramps... I've done lots better on long highway trips in 6th, but I hardly ever do those.
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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