Top 9 Tips for Buying A Fuel-Efficient Car

Whether you buy a new or used vehicle, fuel efficiency--good gas mileage--is high on the list of most buyers' concerns. The difference between choosing a fuel-efficient car or one that guzzles gas, will either save or cost you money over the life of the vehicle, which could be substantial. Fuel efficiency varies widely from one car to the next. Obviously you can check the EPA rating for city/highway MPG on the window sticker, although most of us know the average car never reaches those numbers.

You can also check consumer guides, car magazines and Web sites, Web site forums or ask friends, relatives and co-workers which vehicles they recommend as fuel-efficient cars. Don't buy more car than you need, as larger vehicles generally have bigger engines that are less fuel-efficient. Find the most fuel-efficient car in the size group you're interested in, whether a two-seater, compact, mid-sized, SUV or pickup truck. There are several online sites where you can compare fuel consumption ratings of any car.

Your choice of transmission can also affect the fuel efficiency of the vehicle. Generally, a car with manual transmission is a more fuel-efficient car than one with automatic-assuming you shift properly. And a manual with overdrive, tachometer or shift indicator is the biggest fuel saver, saving up to 10% on fuel costs. If you do buy an automatic, which makes more sense for larger cars, the more gears the better.

Under normal driving conditions, smaller engines offer better fuel efficiency and economy than larger ones. All other things being equal, the larger engine and the more cylinders it has, the more fuel it consumes. Additionally, cars with smaller engines usually cost less and gas costs are lower because you don't need higher octane gas. That doesn't mean a bigger engine is never a good choice. In some cases, a larger, more powerful engine may provide the greater fuel efficiency. If you use your vehicle for work or often tow heavy loads, a smaller engine could burn more fuel if it has to work too hard and function beyond its most fuel-efficient range.

Depending on the type and size of motor vehicle you purchase, you may have the choice of front-wheel, rear-wheel, four-wheel or all-wheel drive. The majority of passenger cars and minivans have front-wheel drive, a design that supplies better traction and more interior room than rear-wheel drive. Although front-wheel drive was originally adopted to improve fuel economy over rear-wheel drive by reducing the weight and size of cars without giving up driving performance or interior space, there's really not much difference in fuel efficiency between the two.

And although four-wheel and all-wheel drive provide better traction and braking in certain driving conditions, the weight and friction of the additional drivetrain parts may increase fuel consumption by up to 10% over a two-wheel drive vehicle. Most often in SUVs and pickup trucks, four-wheel drive is enabled at will by the driver when additional traction is necessary. All-wheel drive is an option on some SUVs and a minority of passenger cars. Full-time all-wheel drive, however, makes for the least fuel-efficient car, because all four wheels are always being driven, drawing power from the engine and thus using more gas.

Another way to be a fuel saver, is by limiting the options you select for your car. You may not have realized that many conveniences from power windows, seats and mirrors to air conditioning and seat warmers decrease fuel efficiency and cost you more in fuel consumption. They add either weight, increase aerodynamic drag or pull extra power from the engine or through the alternator. Aluminium wheels are one of the few options that actually reduce weight and thereby increase fuel efficiency.

Obviously, considering other fuel options such as a hybrid electric car, is another choice for a fuel-efficient car.

Nine Top Tips to Maximize Your Fuel Efficiency and Save Money on Gas

With the escalating price of gas, buying a fuel-efficient car makes a lot of sense. Approximately 15% of new car buyers reject a model due to poor gas mileage. Nearly 40% of those consumers who eliminate a full-size SUV due to gas mileage ultimately purchase a midsize SUV instead, while nearly 20% purchase another model altogether. (J.D. Power and Associates, Sept. 2004.)

But even if you don't currently own a fuel-efficient car, there are lots of ways you can improve the fuel efficiency of your present vehicle until you're ready to purchase one of the best gas mileage cars. Your personal driving habits have a big effect on your fuel use and costs. You can better manage your vehicle operating costs as well as minimize the emissions it produces by driving less and more efficiently. Here are some tips to help. First, you need to know what kind of mileage you are getting. Calculate this by filling up your tank and recording the odometer reading-or you can reset your trip gauge to zero. Next time you get gas, fill the tank again and divide the miles you traveled between fill ups by the quantity of gas you bought on this fill-up. This is your car's miles per gallon or mpg. If it's pretty dismal, here's how to turn your fuel guzzler into a fuel saver: Drive slower: The aerodynamic drag on your car increases noticeably the faster you drive. The drag force at 70 mph is about double that at 50 mph, so keeping speed down can increase your mileage considerably. Gas mileage decreases rapidly at speeds over 60 mph. Each 5 mph above 60 mph is like paying an additional $.10/gallon for gas. Observing the speed limit is also safer for everyone.

Maintain a constant speed: Every time you speed up, you use energy, some of which is wasted when you slow the car down again. By maintaining a constant speed, especially driving the posted speed limit, you will improve your fuel efficiency. Just by increasing your highway cruising speed from 62 mph to 74 mph you increase fuel consumption by about 20%! Using cruise control on the highway helps you maintain a constant speed and will usually save gas.

Drive gently: Aggressive driving-speeding, rapid acceleration and hard braking-wastes gas. These bad habits can lower your gas mileage by 33% at highway speeds and 5% in the city. In addition, reasonable driving is safer for you and others, so you may be saving more than gas money. Consider using overdrive gears on the highway, as this decreases engine speed, reducing fuel usage and engine wear.

Avoid Excess Idling: Idling gets 0 miles/gallon and wastes fuel and money, is hard on the engine and adds to toxic emissions. Cars with larger engines typically waste more gas at idle than those with smaller engines. Turn off your engine if you think you will be stopped for more than 30 seconds. However, if you're driving a fuel-efficient car like a hybrid, your electric motor is on when you idle, so you're not wasting any gas at all! Minimize air conditioning: Using your air conditioner in hot weather can increase your fuel consumption by more than 20% in city driving. Whenever possible, close all windows and use the air vents to circulate air instead of air conditioning. You will improve your fuel efficiency in summer by minimizing the use of air conditioning and using your car's flow-through ventilation, especially on the highway. If you must use the air conditioning, set the controls to a level that lets the system cycle, and turn it off once the interior of car is cooled down enough. Also consider such options a sunroof and tinted glass to keep the car cool.

Keep Your Car in Shape: Maintaining your vehicle in top working condition saves you fuel and money, and reduces long-term maintenance costs while minimizing harmful emissions.

Keep Your Engine Properly Tuned-Getting regular tune-ups when your car is out of tune or has failed an emissions test may improve gas mileage by about 4%. If your car has a faulty oxygen sensor and you have it fixed, gas mileage could improve as much as 40%. Make sure the spark plugs, if you have them, are firing properly, replacing them when necessary. Have the engine timing checked for accuracy.

Check & Replace Air Filters Regularly-Replacing a clogged air filter could improve a car's gas mileage by as much as 10%. Additionally, it will protect your engine from impurities. Change this more often if you live in a dusty climate, drive on dirt or gravel roads or if you drive off-road for fun.

Keep Tires Properly Inflated-Your gas mileage can increase by about 3.3% if you keep tires inflated to their proper pressure. It takes more effort and gas for the engine to propel an underinflated tire than a correctly inflated one-which provide less road-resistance, thereby improving fuel efficiency. Beware over-inflation, though, which can lead to handling problems and uneven tire wear. Check tire pressure on a regular basis, looking for signs of uneven wear or embedded objects that can cause air leaks. In winter, check tire pressure if there is a sharp change in temperature, as cold weather decreases air pressure in the tires. Use the Recommended Grade of Motor Oil-Fuel efficiency can improve by 1-2% if you use the manufacturer's recommended grade of motor oil. Also, if you change your own oil, look for motor oil rated as "Energy Conserving" to be sure it contains friction-reducing additives.

Check Which Gas to Use-Choose the correct octane gas for your car by checking your owner's manual. It's not necessary to buy the "super" high-octane gas unless your car manufacturer recommends it or your engine knocks without it. While you won't do harm to the engine, you will be paying more than you need to, since premium (highest octane) gas sells for an average of 17 cents more per gallon than regular gas. Only about 6% of cars sold in the U.S. need premium gas, according to the AAA. Also, avoid topping off your gas tank, since in warmer weather, fuel expansion can cause an overflow and you'll be wasting precious fuel. You want to be a fuel saver-not a fuel waster!

Planning & Combining Trips: Combining errands to do together and in similar areas saves time and money. Several short trips starting from a cold engine can use twice as much fuel as a longer multi-purpose trip that covers the same distance when the engine is warmed up. With a little advance planning, you can avoid high traffic areas, road construction, retracing your route and ultimately reduce the distance you travel while running errands. You'll not only save on fuel, but also reduce wear and tear on your car. Commuting: If you can alternate your work hours to avoid rush hour, you'll spend less time sitting in traffic and burn up less fuel. For stop and go traffic, drive your best gas mileage car if you own more than one vehicle. Contemplate telecommuting (working from home) when your job permits. If you can, participate in carpools and ride-share programs. You can cut your weekly fuel costs in half and save wear on your car if you take turns sharing driving with others.

Traveling: A roof rack or carrier affords additional cargo space and helps out when you have a smaller car. However, a loaded roof rack decreases fuel efficiency by 5%. Reduce the wind resistance and increase your fuel efficiency by putting objects inside the trunk when possible. Also, remove any unnecessary items, especially heavy ones, as an extra 100 lbs. in the trunk reduces a car's fuel efficiency by about 1 to 2%.