Cars wasteful because Air Fuel Ratio is not optimal

Machine settings for Air-Fuel-Ratio is the ratio of fuel to the air intake during combustion in the engine. Mixture ratio is wrong and wasteful to make your car not powered. How do we know we have the optimal AFR?

Three kinds of conditions-Air-Fuel Ratio

    RICH: The ratio of the mixture into "rich" when the supply of fuel into the combustion chamber is greater than the required alias excessive. Excessive levels of fuel combustion does not make better, instead they were less than optimal both from the energy produced as well as efficiency.
    LEAN: While the conditions in which less fuel and excess air content called a "lean".
    STOICH: And the condition is said to ideal if the amount of intake air in accordance with the amount needed to burn all the fuel and the condition is called "stoichiometric" and often abbreviated as "stoich".

    In the automobile gasoline mixture ratio between air: the optimal gasoline is between 14.7:1 to 14.1:1.

AFR practical indications were optimal or not
Well, there are practical ways to find out whether or not fitted AFR settings. One of them can be detected by observing the engine RPM at idle (quiet place with the engine running). If the engine RPM down ride, this is a sign of setting the ratio of fuel and air are less fit.

Therefore, beware of the unstable engine in idle position. Besides resulting in a more wasteful consumption, it is possible the engine suddenly died when the car is racing toward us in the middle of the road.

A better way to find out if the AFR is not fit through the exhaust emission test. When the emission test results showed levels of HC and CO are too high, meaning the fuel entering the combustion chamber is too excessive.

Resetting the ratio of air and fuel mixture (AFR), commonly called the setting of CO and can be done by the mechanics in car maintenance workshops in general.