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Increased pressure causes the cords, even steel cords, to get longer. The exact amount is pretty small for steel cords. I did some rough calculations that seem to show the effect is too small to measure. But it is there.
Increased pressure will make for a smaller contact spot. I don't know if this changes revolutions per mile in a car tire.
I know that tire pressure changed revolutions per mile in a bicycle tire. I could tell the tire pressure from the odometer distance for a known trip.
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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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