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The one way to find out is to measure. The best way to measure drag is to coast to a stop without using the brakes, jack up a wheel, and measure. Then push back the piston and measure again. The drag after driving may be different from the drag after stopping because brake disk wobble can push the pistons back.
I can calculate the effect of the measured brake drag on mileage.
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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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