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My truck's mileage changes 1 MPG per 10 degrees F. The electricity for lights and heater blower is worth a few tenths of an MPG.
Another variable is wind. Five MPH of headwind or tailwind will affect my mileage by about 1 MPG. A crosswind has the same effect as a headwind.
Another variable is elevation change. I regularly drive about 60 miles with an 800 foot elevation change. Downhill averages about 5 MPG better than uphill.
Your mileage, of course, will vary.
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