Originally Posted by antsjeep
WELL..... I guess my evic is lying to me. I'll have to write Jeep Corporate about that. I will update once i get a response.
How are you doing the comparison? Did you replace a brand-new factory filter with a brand new K&N? Drive on the exact same route? Ambient temp exactly the same? Fuel level exactly the same? There are endless parameters that would come into play to make a true comparison, something all but impossible outside of a lab.
Vehicle manufacturers spend untold millions just to gain a fraction of a MPG increase. If simply changing the air filtration system would provide a substantial gain of 2-3 MPG every manufacturer would be all over it.