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Which rear axle ratio do you have? What is the RPM at 55 MPH? My truck is 1850 RPM at 55 MPH with stock size tires, and 1800 RPM with my current tires.
Does the Scangauge MPG reasonably match measured MPG? Is it properly set up with the correct engine displacement? If so, what is your idle RPM and fuel flow? Does the fuel system go closed loop reasonably soon? My truck goes closed loop in less than a mile after cold start, even in below zero temperatures.
The engine fan has a thermal clutch. Is your fan clutch working properly? My engine fan clutch will occasionally engage at startup. It then takes about half a mile to disengage, during which time it makes a loud roaring noise and causes noticeable drag.
Long shots: Set the Scangauge for voltage. The voltage should be about 14.4 volts plus or minus a couple tenths. Make sure the AC compressor is not running by pulling the fuse. This is good practice because the AC compressor is programmed to run whenever you select a defrost setting and run the blower.
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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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