where you will really make milage gains is to hook up some hondata Kpro and endlessly tweak the cruising and low rpm and throttle opening ranges, seeing how little fuel or how little(or negative) cam angles and such that you can get. the fun part is since you are running vtec vtc you can have a real sipper (beyond how the factor sets it, possibly run wicked low or neg cam angles to have a slight atkinson effect) when not getting on it fully, then when your throttle goes past wherever you set it at, you can eek more power than current out of it. I'm looking someday to add this to mine (though I have the K20a3 instead of the K20Z3 so I'm down 50 horse and a some RPMs from you, I can essentially turn off an intake port per cyl)
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