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Hi,
I've removed the AirTabs because they were hurting the MPG (by ~3mpg).
I also just removed the Gorilla tape from the "chin" -- I had used it to seal up the air vents, because I thought that if all the air went through the radiator, it would help. In fact, sealing it up hurt my MPG.
I have also done a partial block (covering about 2/3's) of the lower grill opening, and while I don't know if it is helping improve the MPG's yet -- but it is not hurting the temps! Not even a little bit...how much extra grill is there?
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