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Old 12-28-2011, 09:20 AM
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FDBDW FDBDW is offline
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Makes sense to me,

larger diameter tires(W/3.55s), more aggresive tread and heavier = 1-2mpg
level kit = 1-2mpg
speedo off= 1-2mpg
K&N drop in isnt gonna do much (it didnt for me), the upside to those are they last for ever.
Flowmasters are better than stock but are still restrictive ,
I would say you are right on the money with the mods you have equaling the mpg lose you are experiancing.
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