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Fuel economy in automobiles

Environment

Hydrocarbon emissions and other pollutants such as carbon monoxide and oxides of nitrogen depend mainly on how much the vehicle is driven and how well the emission controls are functioning. There is little connection between these emissions and fuel consumption, although it is to some extent dependent on the circumstances causing the difference in fuel economy. If, for example, a vehicle suddenly experiences a dramatic change in its fuel economy due to something going wrong with the vehicle, there is likely to also be a significant impact on the vehicle's emission performance. But if that problem does not affect the vehicle's emission control system, then there may be little or no impact on emissions.

How to save gas?

Walk, bike, take a bus, or carpool when possible - Use your car only when necessary. Public transportation authorities often have carpooling information as well as transit services. If you own more than one vehicle, drive the one that gets the best gas mileage whenever possible.

Combine errands into one trip - Consolidate trips to destinations that are near one another. Once you arrive, park and walk between destinations. Save errands for one afternoon and plan your trip so you don't retrace your route. You not only save gas this way, but reduce wear-and-tear on your car.

Drive your car wisely and maintain it properly. The way you drive and take care of your car can make a big difference in your gas mileage. You can greatly improve your mileage by having your car serviced regularly and by driving wisely.

Go easy on the brakes and gas pedal. Avoid "jackrabbit" starts by accelerating gradually whenever possible. Also, anticipate stops to avoid sudden braking. Turn off the engine if you anticipate a lengthy wait. Instead of idling at a drive-up window, park the car and go in. Idling burns more gas than restarting the engine. Limit car warmups in cold weather.

Avoid carrying unneeded items in the trunk. Extra weight decreases gas mileage. Also, reduce drag by placing items inside the car or trunk rather than on roof racks. Avoid high speeds. You can improve your gas mileage about 15 percent by driving at 55 mph rather than 65 mph.

Use your air-conditioning only when necessary. Roll down the windows or open the air vents to keep your car comfortable on not-so-hot days. If your car is equipped with overdrive gearing be sure to make use of the overdrive gear as soon as your speed is high enough. If you have a manual transmission, the lower the shift speed, the better the fuel economy. Your owner's manual will give you further information.

Keep the tyres properly inflated and aligned. Periodic wheel alignments and keeping the tyres inflated to the maximum recommended pressure can improve your gas mileage. Get regular engine tuneups and car maintenance checks. Tuneups improve performance as well as gas mileage. Check your owner's manual for recommended maintenance schedules. By following the manufacturer's recommendations, you should avoid fuel economy problems due to worn spark plugs, dragging brakes, low transmission fluid, or the transmission not going into high gear.

Understand your needs and buy accordingly. Get only the options you really need. Optional equipment that adds weight to your car can decrease your gas mileage (especially heavy options such as four-wheel drive). Automatic transmissions generally degrade fuel economy. Larger engines and higher horsepower typically result in lower gas mileage. If you need the additional power, be aware your gas mileage will suffer during all types of driving. Check the gas mileage ratings of similar vehicles. Buy a fuel efficient model in the size category that meets your needs.

(From the NET)

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