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My truck had recessed fog lights. I covered them with clear covers, but there was no detectable change in mileage.
I had another reason for covering them. The first time I really needed them, in a heavy snowstorm, they did not work because the recessed openings had filled with snow. I had hopes that smooth covers would work better in heavy snow. Unfortunately, the first heavy snow with the new covers was a heavy wet snow that stuck to everything, so the fog light were still useless.
That's why my conveyor belt air dam does not have fog lights. Edit: I see that I need a new profile photo with the new air dam.
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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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