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Thanks guys, the back of my car is impossible to keep clean so it is worth the little in MPG I will loose. I hope to gain enough from my other mods to more than offset the loss. I am planning on blocking the upper grill completely once I get a Scangauge so I can monitor the temp before and after. I am also redoing the underside of the car with sheet aluminum where I can and adding deflectors in front of all four wheels to move the air away from the tires. I should have new tires soon that will also help. I usually bump the TP up by 15% - 20% over the recommended pressure but always under the Max pressure rating for the tires. Living in Arizona the tire pressure can get really high when it's 115F in the shade. I am also working on a windshield wiper deflector I can live with. I am not sure how much it will help. I may be better off trying to build a bug deflector that will push the air up enough so I won't need to build a windshield wiper deflector.
Al
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