Posted on 4/30/2026
Fuel economy rarely changes overnight. It tends to drop gradually, which makes it easy to overlook at first. You might find yourself filling up more often or noticing the fuel gauge dropping faster than it used to. That change is usually a sign that something in the engine or related systems is no longer working as efficiently as it should. Finding the cause early can help you avoid higher fuel costs and prevent additional wear. Worn Spark Plugs Affect Combustion Spark plugs ignite the air-fuel mixture in the engine. As they wear, they burn fuel less efficiently. That leads to incomplete combustion and wasted fuel. You may not notice a major performance issue right away, but fuel economy will start to drop. Replacing spark plugs at the right interval helps maintain efficient combustion. Dirty or Faulty Air Filter Restricts Airflow The engine needs the right balance of air and fuel to run efficiently. A clogged air filter reduces airflow, which ca ... read more