Hello Knuckles,
I'm sticking with that name instead of the other one. You originally introduced yourself that way, and it's how your name will always show up on the screen unless you change it.
The general consensus here is that other things being equal, you will get better fuel economy using a warm air intake (usually acronym-ed as WAI) to reduce pumping drag in the engine's movements.
Since you have tons of questions, let me refer you to a one-stop shopping venue that will get you past a lot of the obvious stuff:
http://ecomodder.com/forum/showthrea...-mpg-5170.html and the related behavioral changes that will help make the most of those mods:
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com