That engine / transmission combination is the largest limit to your gas mileage. You might consider replacing with a small block Chevy in front of the six speed manual transmission from a late model Chevrolet Colorado. That transmission has the widest ratio range I've heard of. With the right rear axle ratio, first gear is low enough to get any load started, and sixth is enough overdrive to keep any hypermiler happy.
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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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