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A friend once told me that his airplane would cruise about 2 MPH faster when he washed the bug splats off. His normal cruise speed was over 200 MPH.
It makes a difference when the roughness extends past the boundary layer. Some airplanes will use flush head rivets where the boundary layer is thin, and round head rivets where the boundary layer is thicker.
I'd be very surprised if somebody was able to measure the MPG difference from removing bug splats from a car. Waxing, no way.
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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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