What Are The Possible Causes Of Poor Mileage Of A Car?


2 Answers

Faizan Rauf Profile
Faizan Rauf answered
There can be numerous causes of poor mileage of a car. First of all, it depends on the transmission of the car: whether you have a manual or an automatic transmission on your car. Cars which have a manual gear box are having a better mileage compared to cars which have an automatic gear box. Let's take the example of a Toyota Corolla. A Corolla with a manual gear box might be having an average of 12km/ltr.

However the same car with an auto gear box will be having a much lower mileage compared to the manual geared Corolla. The reason for this is that automatic transmission cars consume more fuel than manual transmission cars which leads to a poor mileage.

Another reason for poor mileage can be the tuning of your car. This involves setting of the car's air filter, spark plugs, and plug points. People who want better acceleration and performance for their cars have to compromise on fuel economy sine they have their cars tuned in a way that more fuel is being consumed which leads to poor mileage.

Another reason for poor mileage can be the condition of your car. If your car is very old and has its engine being opened up many times for repair, fuel economy will suffer. The use of air conditioner in cars also leads to a poor mileage. E.g. a car gives you 400kms in a full tank of fuel without the ac being switched on. The same car will give you about 250-280 kms if you have your ac switched on for the full duration of your journey.
Syed Asim Profile
Syed Asim answered
The engine of any automobile car works through a mixture of air and fuel, only a small quantity of fuel is required to initiate the ignition process because the flash point of air is very high and that of fuel is very low thus a less amount of fuel is sufficient for the burning of the air and fuel mixture. However sometimes the automobile starts consuming a lot of gas the reasons possibly are plugged exhaust if the exhaust system is not working well it means that the engine is not able to exhaust out the un-burnt portion or bi products of the combustion cycle.    These gases contaminate the air and fuel mixture which will then not burn efficiently. To compensate for the efficiency of burning the engine and the metering system will automatically increase the amount of gas in the system so that burning is done properly, but technically speaking it is an inefficient engine.    The other reason for the increased consumption of gas is retardation of ignition timing i.e the ignition is either happening slower or not at the proper time this may lead again into improper combustion of the air and fuel mixture to the ignition must be initiated at a certain pressure of the air an fuel mixture if the ignition does not occur at that time the metering system of engine will add some more gasoline to increase the pressure and ensure proper ignition.

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