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Here are the the facts from all the testing been doing. 1. FORD said in Hotline Assistance Request that The Approx. engine Operating Temp should be 202-212deg.F 2. The best MPG temp range is 202-230deg.F 3. Starting with cold ICE and outside temp from 37-70deg.F driving hwy loop of 14.1mi you gain average of 4.MPG with Grill Covers on vs off. 4. 3-4MPG gain city driving. The Grill Covers heat up ICE quicker and keep it warmer than without Grill Covers. There is about a 30-40deg.F WT difference with Grill Covers on and off. Even at 70deg.F outside temp I could only get to 200deg.F occasionally and most of the time 180-190deg.F. range. 5. The Grill Covers really helps short trips 3-10mi because of short heat up time for ICE. Adding oil pan heater improves MPG's another 2mpg. 6. Because shutters open when the CMAX is stopped Grill Covers keep ICE warmer longer than without. As more people get experience with Grill Covers we will add more Post.

I have had a number of members ask me for LEXAN Grill Cover Sets which they can't do themselves, so I decided to help them out.  I bought some more LEXAN Sheets to make Grill Covers for those who need them. They are going for $100 including USPS Priority Mail.  PM me for the details. :)   Paul

Improve your Winter MPG's by 4MPG by Taping up your grills. The strategy here is to minimize heat lose, because the ICE needs to get up to operating temperature(202-212*F) to get the best MPG's. All heat comes from burning gas so the less you use to heat up the ICE the better your MPG's. BTW taping up the front of your car has another benefit of protecting your paint job. Supplies you will need, Heavy Duty clear packing tape,Windex cleaner and car wax. Clean and wax areas to be tape to make it easier to get off. You need to setup your Smart Gauge like this. This is accomplished by toggling down Display menu to MyView then toggling right one step and then toggling down till you get Engage display. Then toggle right one step and then down till you get Temp display. Then hit OK button in the middle to save this, you can monitor MyView for water temperature. Then open hood and tape up intake holes as in the pics below. This keeps cold air from going into the intake of ICE, instead uses warmer air from the engine compartment which helps the ICE warmup sooner. Next close hood and tape up the top grill opening to keep cold air from going into ICE compartment as shown in the picture. Next tape up center grill as shown all the way across the two openings. Do the same thing to the lower grill. You can also tape up hood and head light joints to keep cold out. EASY! If you don't like it you can pretty easily take it back off. Good Luck :)Paul