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Partial grill block that also wrapped under the bumper till the oil pan - yep
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grill blocking always sounds good to me, so long as you can monitor temps
i think adding an air dam was probably my most helpful aero mod. rounding off the bottom of the front end might have an opposite effect.
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Testing time. 31.88 mpg with those mods. 
I was getting 31.70 with 35 psi and no grill mod at all. (best tank ever)
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i wouldnt read into it too much unless you control for as many variables as possible and do a-b-a tests back to back