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I drive 3 miles to work and hit 40 MPH maximum. The trip mileage will vary by +/- 3 MPG depending on the wind.
Once I drove 3 miles at 35 MPH against a strong headwind and got 20 trip MPG. The truck sat long enough to completely cool off, then I drove back at the same speed with a strong tailwind and got 30 MPG.
Aerodynamic drag is important even at low speeds.
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