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Way back when, I built a sailing dinghy out of 1/4" fir plywood. Standard lumber yard plywood, not marine grade. Painted it inside and out with a good coat of primer, followed by a topcoat of enamel. All surfaces were fully coated, no gaps or thin spots.
That boat was stored outside upside down on blocks when not in use. I sold it after nine years. The plywood was perfect - no weather checking. Some of the bottom paint was wearing thin and starting to expose the primer.
I believe that plywood checking is caused by wet/dry cycling. If all surfaces, including hidden surfaces, are sealed, then the wood maintains a constant moisture content. Constant moisture equals zero expansion/contraction, so no checking.
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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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