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Search function. It's been covered in 100's of threads.
Look specifically for WAI, HAI, and grille block. The theory, benefits, and associated risks are brought up and discussed to no end all the time.
Also, check the 65+ Efficiency mods and the 100+ Hypermiling techniques links at the top of the page for tips and tricks, and better explanations of some of the normal subject material that comes up on this site.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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