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On a car that old, I'd check the cam timing. Then check the ignition timing, not just the idle timing but the timing at higher RPM and the amount of the vacuum advance.
Check for brake drag by checking brake temperature after driving ten miles or so, preferably at highway speed. Coast to a stop, then check each drum with your hand. They should be at ambient temperature. If it's warm, it's dragging.
Manual or automatic transmission? What is the RPM at 60 MPH? What is the available power in top gear at 60 MPH? Will it maintain speed uphill without downshifting? Accelerate uphill without downshifting?
Tape some pieces of yarn to the hood and drive on the highway. If they all point rearward, you are good. If some of them swirl around in circles or point forward, there is room for aerodynamic improvements to the front end.
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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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