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You have to test your specific vehicle. Use an Ultragauge or Scangauge to watch the coolant temperature.
My truck, for instance, had the upper grille, the lower holes, and the slot between the grille and bumper fully blocked. The only opening was the slot behind the license plate. The AC worked fine at 100 deg F on a level road, and at 93 F on a sustained upgrade.
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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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