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Aggressive driving and excess weight in a vehicle can dramatically reduce fuel efficiency. According to U.S. Department of Energy, aggressive driving that includes rapid acceleration and braking wastes gas, lowering gas mileage by 33 percent on highways and 5 percent when driving around town. Driving at higher speeds can also negatively affect gas mileage, which begins to decrease rapidly at speeds above 50 miles per hour, with each five miles per hour more than 50 mph akin to paying an extra $0.25 per gallon for gas. Drivers who treat their vehicles as rolling storage closets also could be wasting fuel and money, as the DOE notes that an extra 100 pounds in a vehicle could reduce its miles per gallon by 2 percent.