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Some other factors:
Temperature. My truck gas mileage improves by almost exactly 1 MPG for every 10 degrees F temperature increase. That's for temperatures from -20 deg F to about 75-80 deg F. At higher temperatures, the increased air conditioning load balances the decrease in drag.
Elevation. On a particular 72 mile trip, I used to get 3-4 MPG better driving north. There was a net elevation difference of 800 feet, with north downhill.
Wind. A 20 MPH headwind will decrease my gas mileage by about 3 MPG, with a similar increase if it is a tailwind. Crosswinds hurt mileage similar to headwinds.
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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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