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From ASHRAE Psychrometric Chart #1: At 100 deg F and 80 deg F dew point, the air density is 14.7 cubic feet per pound. I've seen hotter, but not by much.
From ASHRAE Psychrometric Chart #2: At -30 deg F, the air density is 10.8 cubic feet per pound regardless of humidity. That's about the coldest we normally see, but there was the day that I drove to work at -46 deg F.
14.7 / 10.8 = 36% difference.
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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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