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You should be getting much better mileage than that. I suggest checking compression, preferably with a leakdown tester. If you are losing compression, the leakdown tester tells exactly where it is leaking. Also check the cam timing.
Have checked for brakes dragging or excessive rolling friction? Nothing should be hot after a highway run followed by light braking to a stop.
Ultragauge / Scangauge is your friend.
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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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