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I run snow tires year around (Nokian Hakkapeliitta). Those tires are snow rated, plus they claim low rolling resistance. I am currently running about 40 PSI in the tires.
I do know that my truck coasts better than my wife's Ford Focus, a friends GM Tahoe, and a government Chevrolet Colorado. I did one informal, not documented, test of tire pressure. It coasted noticeably better at 45 PSI than at 32 PSI, so I pumped up the tires and never looked back.
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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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