If I was in the OP's position, I'd start with a 2WD pickup similar to my truck, and do what I've done so far. Then I'd do a full Phil Knox T100 aero job to it, followed by alternator delete with a solar panel on the topper. LED lights.
I might experiment with a bullet nose (Airflow BulletTruck, 1970 Dodge Charger Daytona) and/or a boattail.
I would then expect at least 40 MPG summer average.
I carry a set of tire chains for winter, so don't need 4WD.
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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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