A photo showing the air dam stiffener from underneath. The angles are UHMW plastic from McMaster-Carr ($3.00 per foot).
It does a good job of holding the air dam to the same curvature as the bumper out at the ends, but I suspect the middle blows back. I'll be adding a couple of braces similar to what Kach22 did, except my stiffeners will by something 1/8 X 1 steel so that I can bend them back easily after contacting a snow band.
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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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