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Small carbs get better mileage than larger carbs because higher air velocity through the carb does a better job of atomizing the fuel. A four barrel carb can do better if the primary venturies are small AND you drive so the secondaries never open.
A beater truck used only a little will never pay off $400 upgrades. Do the cheap stuff - carb rebuild, rear main, tire pressure, driving habits.
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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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