Offload any unnecessary items to reduce the fuel consumption of your vehicle. Hauling rooftop cargo also increases drag, which can reduce fuel economy from 2% to 8% in city driving, 6% to 17% on the highway, and 10% to 25% at 65–75 mph. An extra 100 pounds in your trunk, for example, could reduce your fuel economy by about 1%. The additional weight of items left in a vehicle requires more fuel to propel your vehicle. For information on how cold weather affects fuel economy, see ’s Fuel Economy in Cold Weather page. Trip planning can reduce the distance you travel and the amount of time you drive with a cold engine. Engine and transmission friction increases with cold engine oil and other drive-line fluids, making the engine less efficient. Shorter trips can use twice as much fuel as one long, multi-purpose trip that covers the same distance, when the engine is warm and at its most fuel-efficient temperature. Combine TripsĬombining trips can save you time and money by avoiding unnecessary stopping and starting of your vehicle, which can be an issue in colder climates where it takes longer for your engine to reach its most fuel-efficient temperature. Driving more sensibly is also much safer for you and others. Obeying the speed limit, accelerating and braking gently and gradually, and reading the road ahead can improve the fuel economy of your vehicle by 15%–30% at highway speeds and 10%–40% in stop-and-go traffic. Using cruise control on the highway can help drivers maintain a constant speed vehicles use the most energy when accelerating. Reducing your speed by 5 to 10 mph can improve fuel economy by 7%–14%. For light-duty vehicles, for example, every 5 mph you drive over 50 mph is like paying $0.18 more per gallon of gas (based on the price of gas at $2.63 per gallon). While vehicles reach optimal fuel economy at different speeds, gas mileage usually decreases rapidly at speeds above 50 miles per hour (mph). Speeding increases fuel consumption and decreases fuel economy as a result of tire rolling resistance and air resistance.
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