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We used to have a 95 Neon with the base engine and AT. That engine has peak torque about 4000 RPM, but ran about half that RPM on the highway. The car got almost the same mileage at 80 MPH as at 60 MPH. It ran noticeably better at the higher speed because the engine had so much more torque.
It would really benefit from a cam that moves the best efficiency point down to about 2000 RPM, followed by transmission shift point recalibration if you have the AT. And get the torque converter to lock up sooner. That car had way more power than it needed, anyway.
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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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