5 Major Causes of Poor Gas Mileage

Posted on June 17, 2013 · Posted in Auto Electrical Repairs

North Perth Car Repairs

The rising gas price is always a hot topic during conversations among friends, especially in households. Every car usage consumes gas and going to work, to the grocery store and running errands are all inclusions. The rise in cost makes people think twice especially for people who are struggling with a low income.

But cars are no longer just a necessity; it’s more of a convenience. Although there are those additional expenses for car maintenance, the need for a private vehicle still outweighs the commuting scenario where you can undergo great torture during rainy seasons. Of course, there are always ways to minimize car expenses. To start, we can point out reasons of poor gas mileage and find ways to manage those causes that could lead to monetary savings.

Under-inflated tires

Under-inflated tires are a common cause of poor gas mileage. It increases the rolling resistance causing your engine to work harder and burn more fuel as a result. Gas mileage drops by one percent for every 2 lbs the tires are under-inflated. In addition, under-inflated tires wear more quickly. Properly inflated tires increase gas mileage by up to 3 %; so check tire pressure regularly. You can find the proper tire pressure for your car on the tire banner that is usually attached to the door edge, door post or glove box lid.

Speed and acceleration

Maintaining a slower speed can result in a 7% to 23% savings in fuel economy. Gas mileage rates begin to decrease at speeds over 60 mph.

Heavy trunk

Look for the gross vehicle weight rating or GVRW listed on the door sticker. Extra weight in your car causes the engine to work harder and consumes gas faster. Remove excess items and make sure that your things in your car are not dishevelled. A reduction of 100 lbs in excess weight can save from 1% to 2 % in fuel economy.


Regular tune-ups will increase your gas mileage by up to 4%. If your engine is in poor running condition, a new set of spark plugs might be a good place to start to get it back into shape. Change the fuel and air filters if the same problem persists. If your car has a distributor, replacing the distributor cap and rotor is also a good idea. Refer to your owner’s manual for the correct tune-up schedule for your car.

Idling and air conditioners

An engine running while staying in place is a waste of gasoline. Idling doesn’t only contribute to poor gas mileage but also adds up to pollution. If possible, look for a cool area to park so you can turn off the air conditioner. Car air conditioning by itself consumes gas and having it on causes a lot of gas to be wasted in powering the system. Turn off the car when waiting. If you can, turn off the air conditioner and ride with your windows open. At higher speed, close the windows though to reduce drag.

There are a lot more ways to extend the life of your car and increase its gas mileage. For more tips, ideas and information visit us online at www.northperthcarrepairs.com.

You can also drop by our shop, North Perth car repairs for any of your vehicle troubles, our highly trained mechanics and technicians are available 24/7 to cater your needs.