Good job! I put an upper grill block on my minivan and used clear packing tape over my foglights. I did try a lower grill block in addition to the upper, but that is too much for the amount of climbing I have to do in the Colorado mountains. It might be OK for you in the winter where you live, but if you try it be sure to watch your gauges and don't let the temp slip too high.
If you want to see really significant mpg gains, slow down!
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