K+N filters let more air in, more air also lets in more fuel.
If your transmission is weak this can also reduce your MPG.
Are you running 5W30 oil?
Also if you have a car load of crap effects MPG too.
If your O2 sensors are original they can also effect MPG.
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Mark V
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1998 Explorer 4.0 SOHC
1998 Windstar GL 3.8
2001 Corvette Coupe 6 Speed
2006 Honda Shadow Spirit 750 http://public.fotki.com/snextime/
If your Exhaust tip is bigger than your cylinder bore, you are a Ricer!
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