You have a good feel for the gear ratio tradeoffs. I suggest working on aero and rolling resistance first. Aero would include grille block, wheel covers, belly pan, possibly an aero topper. Rolling resistance is tire pressure, front end alignment, and LRR tires. And a kill switch.
Don't forget aero for the trailer. Teardrop trailers look terrific from the side, but those square corners in the front can cause problems.
When you have done all that, then reevaluate gear ratios.
MTA: Plus what Cobb said.
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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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