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My grille is fully blocked, except for a small opening under the license plate. You can't see that opening in the photos. The air going into it is moving straight up.
I only saw the temperature rise once. It was a 93 degree day, AC going, and a long upgrade. The rise was only 5 or 7 degrees F, not enough to turn on the engine cooling fan.
The best place for getting air to the radiator is low and center - that's where the highest pressure is found. All vehicles are different, so you will need to find out for yourself what works. The above advice about making sure that all air goes through, not around, the radiator is 100% correct.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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