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Something is wrong. With the transmission in a direct drive gear, the engine should be running about 3000 RPM at 60 MPH. Either your tach is wrong (set for 6 cylinder, maybe?) or you are driving in 3rd gear of a 4 speed.
If it's just tach error, then I suggest that whoever looks at your carburetor check it over very carefully. You might be running a full rich power mixture all the time. Most carburetors have some sort of wide open throttle fuel enrichment. If that sticks open, your mileage will about half of what it should be.
Way back when, a friend had an early 60's Chevrolet Nova 6 cylinder automatic. With his driving style, he should have averaged 20 MPG, but in fact averaged 10. His power valve was stuck open. The car started and ran great, it just sucked gas.
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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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