An overdrive transmission is probably the biggest thing you could do to improve mileage in that car. I know that a lot of GM parts interchange. Would a transmission like the 5 speed in my truck bolt in? It's got a 0.73:1 fifth gear and a first gear that will pull stumps with one of those engines.
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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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