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I regularly run as low as 600 RPM (18 MPH) in 5th gear. It will even accelerate, although slowly, from that speed in 5th. I've been driving that way since the truck was new. It now has 98,000 miles.
The alternator cannot keep up at that RPM, the voltage drops to 13 V.
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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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