How sure are you that the K&N drop in is helping, rather than hurting or doing nothing?
Regardless, you've already spent the (unrecoverable) money, so hopefully it does something for you.
Check out these links at the top of the page:
65+ Efficiency Mods
100+ Hypermiling Tips
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
