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Dirt will hold wood posts perfectly well. IF you backfill the hole one shovel full at a time, and tamp each layer. A six foot length of 2 X 4 makes a good tamper.
I built a deck about 15 years ago using 4 X 4 wood posts. Dug the holes, dropped in half a bag of instant concrete, tamped the concrete (figuring ground water would set the concrete), set the posts on top of the conrete, and backfilled and tamped. The posts were solid as a rock and never shifted in 15 years.
I would not set metal posts in concrete, though.
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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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