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Manual or automatic?
Put in a ScanGauge or Ultragauge and monitor the vacuum. If you are running 15" to 20" Hg during highway cruising, you would definitely benefit from a taller gear. If you are running 5" to 10" Hg vacuum during highway cruising, you are right at the best rear end ratio. Note that SG reports MAP, so 20" vacuum is about 5 PSI MAP.
As for passing, that's what the other gears in the transmission are for. Also driving skills like anticipation and getting a running start.
In the world of gas mileage, it is a good idea to know how much you are held up by not passing a slower driver. For example, if you normally drive 60 MPH and you are stuck behind somebody driving 55 MPH for 10 miles, your total delay is less than 55 seconds.
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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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