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The 235/75R15 tires are 2% oversize, so about 1800 RPM at 55 MPH. My truck has the 3:73 rear end.
I did an informal coasting test after installing the current tires. After increasing the pressure from 33 or 35 PSI to max sidewall of 47 PSI, it coasted much better. They have been at 47 to 52 PSI ever since.
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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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