Everything you added except for the bed cover eats up MPG unless you keep your foot off the gas, like that is gonna happen. A good tune up with stock parts would have made the same increase in MPG as the expensive HP parts you added.
Removing the tailgate is a Myth, Mythbusters found out having the tailgate up actually increases MPG.
Pumping up the tires over the suggested pressure that is stated in the door jamb will actually decrease MPG and make the center of your tires wear out a lot faster than the rest of the tread. A very expensive way to ruin a set of tires.
You started with the wrong type of vehicle to save gas on.
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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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