On a hot day and traveling in a car, which method of keeping the occupants comfortable with the A/C is more energy and fuel efficient?
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Set the thermostat to a lower temperature and keep fan speed to the lowest setting
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Set the thermostat to a slightly higher temperature and compensate by setting the fan to a higher speed so you can feel cool enough with the breeze
My AC makes a notable difference in fuel mileage, even taking into account, the fact of gasoline density between summer and winter
Like, just forgetting I have my defroster on in the winter now makes a notable difference in how much fuel it takes compared to just the arms and legs setting