According to the data we got from the Energy Star website when turning on the AC in your car, it will consume from 0,5 to 1 gallon of gas per hour. And of course, this number will increase when driving during the peak hour.
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Slow Down and Drive ConservativelyFor light-duty vehicles, for example, every 5 mph you drive over 50 mph is like paying $0.30 more per gallon of gas (based on the price of gas at $4.32 per gallon). Reducing your speed by 5 to 10 mph can improve fuel economy by 7%–14%.